Initial convinced the mouse by its price. After delivery she makes a valent stable impression - no I did not drop out of testing on the ground and I did not also occur in the future. The mouse is now since 2-3 weeks daily operation - normal tasks: Microsoft, surfing, no `gaming 'and met my requirements to 99%. I had 2x the situation that they did not work immediately after power-up - pull USB, plug it in again, problem solved. Commissioning is i ...... sure - USB in, check battery, a little patience and you go there and for transport in mouse bottom a small USP-Stick garage.