I have the mouse now been well over a month and am very happy with it. It normally does not always need all the buttons. Overloading I do not find this mouse. After a short familiarization phase, it can play very well with the mouse. The X-Celerator is against habituation thing. Flying there can thus not so simple. Since I always just playing the keyboard / gamepad, it is probably due to me, because I'm used to another. The 8200dpi I do not scoop as well as with the previous products from more.
So far me no defects are staying, and was 100% fun experience with your mouse. Otherwise, the mouse as the previous Roccat products is really great. Expensive but really worth Pricewise!