We cutting a load of poles. Stihl MS 661 vs Jonsered 2159. I had the 2159 he had the 661. I cut 10 chords of wood he cut 2. That 661` sounded it was hitting the rev limiter. What a great feeling to smoke that 661. Morel of the story I will stay with old school as long as possible. He left me the 20 inch plus wood and picked on the smaller stuff.