I mainly use an Echo 400 adapted to run a regular (not narrow, small tooth) 3/8s chain on a 20" bar. and an Echo590 with a 36" bar.
Have had both for about 13 years on our farm and harvest about 9-10 chords a year for firewood. Mostly oaks but a mix.
Two years ago I gutted the 400 muffler and rewelded the case. Pulls a lot better, incredibly better than stock. The only modification it took was jetting change.
The 590 is stock except for the bar. When I went into buy it I asked the dealer what he sells the most of, Without and delay, he said "the cs590".
I do my own maintenance, but other than an occasional spark plug and chain maintenance it has been minimal.
I have a ms250 43cc Stihl, which is harder to pull through than the Echo 60cc.