I haven't used any myself yet but the weights are about the same and speaking with those in my area that have used them; they say that the 4 stroke trimmers such as the Stihl FS 110 RX have a lot stronger power at lower rpms. They said they rev'd as high and maybe a little higher than the 2 strokes. When my trimmer finally craps out, I plan to get the Stihl FS 110 RX. All of my hand held equipment exept for a few pieces is Stihl and I may as well standardize it. I have had excellent experiences with Stihl and highly recommend them. :thumbsup: