I have been using a Stihl fs-110rx for the past year and love it. It does get a little heavy after about a 1/2 hour of trimming but has tons of power. So I hire a helper and needed a second good trimmer so my dealer sold me on the fs-100rs. It feels 5 pounds lighter than the 110 even though its only 2 pounds lighter. It has a quiet tough sound and seems to have just as much power as my 110. Just thought I would pass it along.