Bought one last summer, largely due to the weight difference between the 100 and my Echo 265's. I have a property that, if I do all of it, requires about 2 hours of trimming, and, well, I'm getting a little older. It did feel awkward the first few times I used it, but like anything, you get used to the balance eventually. I really notice it most when carrying the unit, because with the Echo, the trimmer stays horizontal holding it by the grip, with the Stihl, the engine end is heavier. I like the Echo heads better when filling with line, they are faster, for me, to spool, but the Stihl autocut uses a lot less line. I have a tendency to tap for new line more often than I really need to, and the Echo releases a couple of inches at a time, while the Stihl only releases maybe an inch at the most. I find myself filling the spools a lot less often. The only real issue I've had is my last mow of the season last fall. The temperature was in the low 30's, and I absolutely could not get the Stihl to start. Tried the normal, recommended starting procedure. Choke off in case it was flooded, etc. Just would not fire up. Grabbed the Echo off the trailer, and it took off on about the 4th pull. I never tried the Stihl again in the cold, so am not sure if it would always be an issue or not. Of course, I don't normally do much work in 30 degree temps anyway, so it usually wouldn't be an issue.