+1 for Stihl.

The older small engines (mowers, trimmers, chainsaws) were a lot more tolerant of old gas than the new ones.

Nowdays I just buy a small Stihl chainsaw every other year. Paid $199 for the last new MS180 and sold the old MS180 on CL for $125. So, for $75 I get a new saw with two new chains. The chains alone would cost me $45.

All the trimers I've had have cutter head problems before the engine fails.