I have been using Professional saws since WAY back to the mid-1970's. Like everyone else right out of High School I bought and used what I could afford. First saw was a Mac 610, and although pretty much a "turd" for power we cut firewood for three farm houses with it for several years. I saved up my money and bought my first Husqvarna, a 480CD. I still have it today and it has at least a zillion hours on it and still perfect compression and runs as good as it did the day I bought it. In all these years it's only needed a tank vent, kill switch and linkage on the throttle of the Tillotson carb brazed to the shaft.
I also have a really strong 268XP, and two 55's (closed port). Had a nice 181SE and 262XP but sold them recently.
I've filled the voids with Echo saws instead, and seldom use any of the old Husqvarna's. Not because they don't make the grade, I'd rather just beat up on the newer Echo's and parts support for them is solid.
I'm not going to pound my chest here and tell everyone how great Echo saws are. They have a few nice saws in the line-up, and a few "home-runs", and sadly a few "turds" as well. Educate yourself as to which ones are the best of their line-up and which ones to avoid.
My "go-to" saw these days is the CS-510 and CS-590 and the little CS-370 is in the basket on my Quad 24-7 for light work when I'm checking out the trails on my property. No more than 2 pulls ever to fire one up, and they run flawlessly. Pound for pound the CS-510 is the strongest of any Echo saw I've owned, with the CS-600 and CS-620PW a close second. All are stone stock with only limiter caps removed and very minor muffler mods.......Cliff