The end came with the left mouse button. It felt as if worn off a little, and I would microswitch can no longer operate reliably. A month later (yesterday) was nothing more, and after opening the mouse (deduct Gleitpad, then with a PZ0 not PA0, Phillips solve 4 screws) was revealed the drama. Double breaking of the pin, which should operate the micro switch. The first fraction at the top was probably a splinter, which is why I no longer so easily hit the microswitch, the 2nd break base of the pin then resulted in the well of the then somewhat stronger operating mine.
The pin Right has also been significant signs of wear, inside the mouse is around both microswitches very fine white plastic dust.
The cause is the one that does not vertical motion of the two pins, a classic bad design. Thus, the pins are always loaded diagonally. Secondly, it looks to me like, as if the plastic quite brittle.
Absolutely unacceptable quality for this price range and a mouse in my opinion, already borderline in the "fraud on customers". Because of this wear is installed and caught sooner or later every Naga.