I have been having trouble with my elbow hurting using a Stihl with the bicycle bars and I also felt a little under powered with the FS 55. I have been thinking about getting a larger trimmer with the 'D' handle in hopes that it would help. I got lucky today and picked up a Stihl FS 110 for $250. If all of Stihl's 4-mix stuff is like this thing, I'm sold. I liked Stihl products before, but this thing is much better to me! I'm looking forward to going from the 420 back pack blower to the 600.