I'm to the point where I need another trimmer...well really another good trimmer for my employee to use. I use an FS 80R exclusively now and am looking at other Stihls. That's the only brand. The only dealer in my town worth going to carries them. I own two more pieces of equipment with the 4-mix and have been very satisfied with these. The decision is between another FS 80R, the FS 100R, or the FS 110R. I know the 100 is lighter than both the others. My FS 80R has been very reliable. Cranks on first pull since I got it a year ago. Why is the FS 110R about a pound heavier than the others when it has the exact same motor as the 100? Is the driveshaft solid like the FS 85 was? I'm just trying to get some opinions before I buy one next week.