Chuck slowly reaches into the back pocket of his coveralls, and feels around for his can of "whoop ass".. Oh.. Hell.. There it is!! Let's spray some!!
IMHO, there's two kinds of cutting..
One is where you've got all the time in the world.. you basically buy the cheapest saw that will do the job. If it's slower.. Oh well.. It was cheap ( but still a quality name brand ) ! You only cut 10 cords or less a year... properly maintained, it'll go at least a decade, ( as long as it's not a Chinese knock off.
). For example, I'll use my Echo 355T for stuff that probably really should have been something bigger. I'll use it to drop anything that doesn't bury the bar. ( softwood , Birch. ) But, with no time frame, no hurry, I can finish this tomorrow, or the day after, depending on the weather.. I prefer the lighter saw.. It's easier on my retired body.
Two, is where you're cutting for money.. on a regular and consistent basis. Especially if you've quoted a job at a set price. The customer doesn't give a rat's petootie how long it takes you. It's irrelevant to them. They don't care if you do it with a dull Sawzall. Straight maths, if the cheaper saw ( too small ) , takes ten seconds more per cut, and you're doing 200 cuts a day ( ever cut down a tree that didn't require 200 cuts?) .. that's 2,000 seconds. That's over a half an hour a day. Cut 200 days a year.. That's 110 hours.. almost three weeks ( in man hours ), of work. Think about it.. Three weeks worth of work.. At $25.00 ( minimum ), an hour, times 110 hours, is over $2,500. That'd pay for a hell of a saw upgrade. Waiting for the saw to make cuts? I can't fathom that on a job site. Add onto that, if you're running a crew, if they are waiting for you, ( or your Arborist ), or anyone else on the crew, to drop stuff, so that it can be processed.. that's an additional cost to the job, that eats into profitability. Combine that with ground crew losing seconds per cut, per day, per week, per year.. the results are huge.
IMHO, the best saw that you can get for the productivity that you need, is the cheapest saw that you should get. Profitability gets maximised.
That being said, for occasional use, for " bang for the buck", saws.. there's ton of options. The 500 i really seems like one..