Very poor experience with gas trimmers - my first FS90 wasn't too bad as it did nearly 10 years of work (including six years used on 10-20 lawns, mostly tiny) before giving up. No huge complaint, but still mildly disappointing given its price point. I received a very lightly used one in exchange for some work and it ran great for less than two years - after that, it would run for about 10 minutes and then bog down/die after that. It's at a mechanic to see if anything can be done. Of course, I couldn't fully know how the previous owner used it, although they supposedly only used the pre-mixed Stihl fuel/oil in the can. During 'Stihl days' I decided to give the product one more chance and purchased an FS91. It has been awful. It usually runs fine until it doesn't.... it will randomly bog down and stall out when the trigger is pulled. It has been brought back three times to the dealer who, each time, assures me that 'it's all good, we did some fine tuning but there's nothing wrong with it', only to have the same thing happen. Note that I religiously mix anywhere from 45-50:1. Forget Stihl customer service as it seemingly does not exist. No number to call and my email wasn't answered. I have also owned two Stihl blowers with ho-hum results (carb issues), and a Stihl chainsaw with low hours that either starts ok or tries to rip my arm off when starting it. In my opinion, Stihl commands a premium price for an inferior product. Never again for me, and I am sharing my honest experiences with others.