I joined the Poulan club today with a 4620AVX. That's a 46cc 20" "Poulan Pro" with the toolless bar adjustment system that everyone loves to hate.
I'm not a woodsman but I had a 14" Echo (CS-306) for dealing with tree trimming on my suburban lot. And I had a box elder that was threatening my neighbors house and decided it had to go. I could cut a lot of limbs off it with the Echo (and I did most of the above ground work with a bow saw and unpowered pruning saw - make a man out of me yet!) Anyway, the trunk of this tree was way bigger than I thought I could manage with a 14" bar so I checked out rental options (Makita with 20" bar for about $50 for 4 hours) or a new Poulan Pro on craigslist for $110.
Unfortunately when I got the Poulan home, I found it had no power.
Touch wood and it would stall out. I called the seller up and politely explained the situation. He asked me to bring it back so he could look at it. It turned out that he bought warranty returns and fixed and sold them. Often it was stuff like a new owner dumping the bottle of oil in the saw's fuel tank and then adding gas, so all he had to do was put a proper mix in it, change the plug and he had a virtually new tool to sell. But this one must have had something actually wrong with it. He offered money back or said he would need to order a carb kit and go through the carb. I wanted the saw and he seemed like a decent guy so I went with the carb O/H and return the saw. Today he dropped the saw off and it seems to run just fine.
It does seem like takes longer than I expected to go through a 20" log. None of the 10 second times like I see in your videos, but then again, it has a factory safety chain on it and it has not been hot rodded. But it does seem to make a lot more chips and use a lot more gas than the Echo. I think the kerf might be nearly twice as wide (90SG chain vs 33SL.)
The other problem is that he left the idle set too high. With a couple tanks of gas through the saw, it idles fast enough to run the chain. Where is the best place to find the special tool for adjusting idle speed?
Anyway... I've got a Poulan and it's doing the job. It may not be a saw that I'll hand down to my son (he has a 16" Echo anyway) but I think it will meet my very occasional needs around here or I may decide to list it on craigslist.
-hank