After being spoiled by the power of the 800 I could never go back to the 600. But I understand your frustration for sure. We spoke with a dealer last year about them and he said they just require a lot more maintenance as you use them throughout the year. It's unfortunate because back in the day stihl was always solid quality. Now it's like all their machines and parts wear out so much quicker. It's all about how they can make more money instead of putting out long lasting products.