I made it through one week with this trimmer. I did probably 65 accounts this week. The trimmer has its drawbacks. Its not as powerful as a 4 mix, the flex shaft drove me nuts, and the trigger mechanism is cheap. But, it is light weight, engine is snappy and responsive.
I got past the wobble from the flex shaft by swapping it with an fs100rx solid aluminum shaft. Now theres no more wobble.
I'm going to keep the trimmer and see how long it lasts. I think its a really good homeowner unit, but it's design falls just short of being commercial.