Agreed, very strong running saw for 41cc. It would probably do OK with an 18" .325 set-up, but would be better suited to 14-16" 3/8LP, IMHO. I use mine a lot, and it doesn't like a lean carb setting, even though it rpm's nicely and pulls strong at high rpm's.
The stratto-charged engine seems to prefer a slightly richer "H" screw setting or it looses some mid-range power. This shows up when you start cutting up larger logs with most of the bar buried. Doesn't seem to matter with limbing, and cutting smaller material.
The 435 is very well constructed, and ten times the saw the 141 was that I purchased new about 12 years ago. I recomend them frequently to others, and it's a great saw for a homeowner who is only going to own one saw for small jobs.....Cliff