Nothing but Trouble
I have owned one of these for three years and it has been an absolute pain. Pretty much anything that can go wrong has done so. Predictably this machine is designed so that repair can only be carried out by an overpriced Stihl mechanic.
Three years ago I bought a Stihl chainsaw, brushcutter and hedge trimmer. The latter was the last one still working until it finally died yesterday. It might well be repairable but I am fed up with it letting me down when I need it most.
My replacement brushcutter was an excellent Einhell product and it is them I will look to for a replacement.