I bought a new FS80 a few weeks ago. Right away I didnt like the way it ran. It was rough, hard to start, didnt make much power, and was generally pi$$ing me off. Then a few weeks of use pass... Its a whole new machine! Starts on the 2nd or 3rd pull (instead of 9th or 10th) and runs real strong and smooth. I guess there is a lot to be said for "break in" periods... although I have never had a Stihl before that needed one to run right. My only gripe is that the plastic above the head, where my elbow touches down is too damned hot some of the time.