I have been more of a lurker here for the past year or so. Mostly to get info to help keep my saws running and to fix what breaks. I often come here more to see what others say about a particular saw to see if its worth buying to sell or buying to keep or staying the heck away from. I will try to give my best unbiased review of a few saws ive owned and a couple that I have been able to run often enough to get a good feel of. This is sort of the information I come here for so here's my best shot to return the favor 
Echo 302s
Echo 440evl
Echo 500vl
Olympyk 261
Olympyk 264
Stihl 017 ms170
Stihl 028 wood boss
Stihl 032 av
Stihl 039
Stihl 034 super, 036, ms 360
Soon I will try to add an Echo 702, Stihl 026, Stihl ms 660 and a Makita 6401 before and after the big bore cylinder.
Echo 302s
I started out with this as my first saw. Great saw to start with. Exceptional saw to learn the ropes of firewood cutting with. I find it the same way with a motorcycle. You cant just start out on a Road King, you gotta learn the basics on a Honda rebel first. This saw is very light and feels very balanced with the 16 inch bar. I believe it to be just as light as my 017, which i will compare this to because its the only other saw I have in the 30cc class. I ran a stihl 325 non safety chain on it. This saw would bury the 16 inch bar with no problem, though you could not put a great deal of pressure down on it or it would start to stall, you could still give it a pretty decent down force on it with out a bog. It has no spikes on the front to help dig into the larger logs, after all i believe its a limbing saw. I never had a problem starting this saw. Even in sub freezing weather it started from cold after about the third pull and always started first pull, no choke afterwords. Very reliable. The oil and fuel fill caps are on the top which In my opinion are the absolute BEST place for them. Although the top handle got in the way when pouring oil from a gallon jug. This is a great saw and from the prices they have been going for as used from the dealer, craigslist and ebay, it would be hard to complain about. The one downfall I would give it is the fact that it has no anti vibe system at all. It does not vibrate much at all under no load, the rotating assymbly is well balanced, I had some vibration issues when the bar was full into a cut. But from the price and performace stand point it would be hard to beat. If it had AV points I would more than likely choose it over my 017. Something I want to add that I like on all three of my Echos over my Stihls is the on/off and choke. The Echos have a on/off button on the top of the handle that is easily switched on or off with your thumb from a left or right handed user. Also it is on the top of the handel and provides a easy visual of off or on when you first pick it up with out having to tip the saw down and look at the lever that the stihls have. Also the choke is a plunger type on the right side next to the handel that has a very positive feel on how much choke you are applying, which is nice i guess....but doesnt really help since you usually start full choke then turn completely off. But I do like the setup of these two functions as opposed to the way the stihl single lever is set up.
Echo 440evl
This saw was impressive as a step up from the 302s but I will agree with most everybody on this board that it is not a good saw for any particular thing. It is too heavy to stick a 16 inch bar on and use solely for limbing. It is too underpowered to be used as a strickly bucking saw with a 20 inch blade. I used this as my bucking saw for about 2 months with a 18 inch bar and 325 stihl non safety semi chisel chain. It went through the wood faster than the 302 but was still so slow that I had to buy another saw. It honestly took twice the time to go through a cut compared to a Stihl 032av, which is only 7cc larger. It could be a pain to start when cold but was always started with one pull once it warmed up. The antivibe system was just so so, you could still feel both engine and chain vibes through it. The engine would stay pulling through the wood fine if you did not try to use the spikes for leverage. It bogged so bad when pressure was applied to the handle like that. The air filter stays fairly clean due to the "pre filter" on the black top cover. The filter was also easily cleanable. The location of the oil and fuel caps being on the top, like the 302 are great! I would not recommend this saw to anyone due to its lower power to wieght ratio. Also since the what I have seen, the resale value is still fairly high for these saws so the combination of low power/high price is not what I would look for in a saw, especially since you can find lighter saws, with more power for the same price all day long.
Echo 500vl
Great Saw! This was my bucking saw for over a year. Im a guy that likes to upgrade/change everything after a few months and I stuck with this saw longer than any other. It runs a 3/8 rim sprocket from the factory. I put a 20 inch guide on it since thats all Iu had laying around that would fit an echo. From the start I noticed that it was just a tad bit heavier than the 440vl, though it has the same size and relative shape, (again, with the oil and gas fill caps on top. I LOVE that design). Once in the cut, compared to the 440evl, It's like stepping out of a Buick Regal and taking off in a Shelby Cobra. It seems to rev quicker than the 440 and has so much more power. I found a set of felling spikes to bolt onto the stock cast spikes, which some may think are un neccesary, but I really think they help. As you get into a cut and start putting the leverage on those spikes, as long as the RPM's stay up this is a superb saw. Once you let the chain speed die its a dog and wont pull out of it unless you take full pressure off the bar and chain. This could be a over rich setting on the high needle but it seems that its just barely 4 stroking at no load WOT. I have found that it takes about 3 pulls to start it from cold but it seems to have a mind of its own when starting warm. Most of the time it will start first pull but there are two or three times a day that you have to pull 5 or 6 times to get it to restart after its shut off. The used prices for these saws are all over the board. I picked this up for 50 dollars with out a bar, in running condition. I have seen them go for 200 on ebay. It is known that these saws, were shut down early and are a bit more rare than other Echos. I enjoy cutting with mine due to its lighter wieght than others in its class, much much more power than the 440, its ability to pull the 20 inch bar with 3/8 chain very well and its low price. As compared to the Stihl 032 AV, the 500 is a hair behind it. Not by much though, it will hold its own against the 032 AV but will loose by a thin margin every time. I would choose the 500vl over the 032 because of its lighter wieght (maybe only a pound - pound and a half lighter) and both of the filler caps are on top. But since the engine size of the 500 and the 032 are so close, if wieght and price are not a deciding factor, the 032 does infact cut faster and may actually have better antivibe mounts than the 500.
Echo 302s
Echo 440evl
Echo 500vl
Olympyk 261
Olympyk 264
Stihl 017 ms170
Stihl 028 wood boss
Stihl 032 av
Stihl 039
Stihl 034 super, 036, ms 360
Soon I will try to add an Echo 702, Stihl 026, Stihl ms 660 and a Makita 6401 before and after the big bore cylinder.
Echo 302s
I started out with this as my first saw. Great saw to start with. Exceptional saw to learn the ropes of firewood cutting with. I find it the same way with a motorcycle. You cant just start out on a Road King, you gotta learn the basics on a Honda rebel first. This saw is very light and feels very balanced with the 16 inch bar. I believe it to be just as light as my 017, which i will compare this to because its the only other saw I have in the 30cc class. I ran a stihl 325 non safety chain on it. This saw would bury the 16 inch bar with no problem, though you could not put a great deal of pressure down on it or it would start to stall, you could still give it a pretty decent down force on it with out a bog. It has no spikes on the front to help dig into the larger logs, after all i believe its a limbing saw. I never had a problem starting this saw. Even in sub freezing weather it started from cold after about the third pull and always started first pull, no choke afterwords. Very reliable. The oil and fuel fill caps are on the top which In my opinion are the absolute BEST place for them. Although the top handle got in the way when pouring oil from a gallon jug. This is a great saw and from the prices they have been going for as used from the dealer, craigslist and ebay, it would be hard to complain about. The one downfall I would give it is the fact that it has no anti vibe system at all. It does not vibrate much at all under no load, the rotating assymbly is well balanced, I had some vibration issues when the bar was full into a cut. But from the price and performace stand point it would be hard to beat. If it had AV points I would more than likely choose it over my 017. Something I want to add that I like on all three of my Echos over my Stihls is the on/off and choke. The Echos have a on/off button on the top of the handle that is easily switched on or off with your thumb from a left or right handed user. Also it is on the top of the handel and provides a easy visual of off or on when you first pick it up with out having to tip the saw down and look at the lever that the stihls have. Also the choke is a plunger type on the right side next to the handel that has a very positive feel on how much choke you are applying, which is nice i guess....but doesnt really help since you usually start full choke then turn completely off. But I do like the setup of these two functions as opposed to the way the stihl single lever is set up.
Echo 440evl
This saw was impressive as a step up from the 302s but I will agree with most everybody on this board that it is not a good saw for any particular thing. It is too heavy to stick a 16 inch bar on and use solely for limbing. It is too underpowered to be used as a strickly bucking saw with a 20 inch blade. I used this as my bucking saw for about 2 months with a 18 inch bar and 325 stihl non safety semi chisel chain. It went through the wood faster than the 302 but was still so slow that I had to buy another saw. It honestly took twice the time to go through a cut compared to a Stihl 032av, which is only 7cc larger. It could be a pain to start when cold but was always started with one pull once it warmed up. The antivibe system was just so so, you could still feel both engine and chain vibes through it. The engine would stay pulling through the wood fine if you did not try to use the spikes for leverage. It bogged so bad when pressure was applied to the handle like that. The air filter stays fairly clean due to the "pre filter" on the black top cover. The filter was also easily cleanable. The location of the oil and fuel caps being on the top, like the 302 are great! I would not recommend this saw to anyone due to its lower power to wieght ratio. Also since the what I have seen, the resale value is still fairly high for these saws so the combination of low power/high price is not what I would look for in a saw, especially since you can find lighter saws, with more power for the same price all day long.
Echo 500vl
Great Saw! This was my bucking saw for over a year. Im a guy that likes to upgrade/change everything after a few months and I stuck with this saw longer than any other. It runs a 3/8 rim sprocket from the factory. I put a 20 inch guide on it since thats all Iu had laying around that would fit an echo. From the start I noticed that it was just a tad bit heavier than the 440vl, though it has the same size and relative shape, (again, with the oil and gas fill caps on top. I LOVE that design). Once in the cut, compared to the 440evl, It's like stepping out of a Buick Regal and taking off in a Shelby Cobra. It seems to rev quicker than the 440 and has so much more power. I found a set of felling spikes to bolt onto the stock cast spikes, which some may think are un neccesary, but I really think they help. As you get into a cut and start putting the leverage on those spikes, as long as the RPM's stay up this is a superb saw. Once you let the chain speed die its a dog and wont pull out of it unless you take full pressure off the bar and chain. This could be a over rich setting on the high needle but it seems that its just barely 4 stroking at no load WOT. I have found that it takes about 3 pulls to start it from cold but it seems to have a mind of its own when starting warm. Most of the time it will start first pull but there are two or three times a day that you have to pull 5 or 6 times to get it to restart after its shut off. The used prices for these saws are all over the board. I picked this up for 50 dollars with out a bar, in running condition. I have seen them go for 200 on ebay. It is known that these saws, were shut down early and are a bit more rare than other Echos. I enjoy cutting with mine due to its lighter wieght than others in its class, much much more power than the 440, its ability to pull the 20 inch bar with 3/8 chain very well and its low price. As compared to the Stihl 032 AV, the 500 is a hair behind it. Not by much though, it will hold its own against the 032 AV but will loose by a thin margin every time. I would choose the 500vl over the 032 because of its lighter wieght (maybe only a pound - pound and a half lighter) and both of the filler caps are on top. But since the engine size of the 500 and the 032 are so close, if wieght and price are not a deciding factor, the 032 does infact cut faster and may actually have better antivibe mounts than the 500.