I ordered this mouse get on 12 March 2014. Really big joy was not because she completely refuses to work already on 22 March 2014. This had, however, previously announced a few days, as the brightness of the laser does not change HAT light on the work surface and darker when Anheben- and the laser started flashing. This is of course a mouse too little and Microsoft should work on the quality.
2 stars she gets out of the ground, as I have previously used the identical type mouse about a year and was actually quite happy. She was not always reliable on all surfaces and after the year of the rubber ring has been slowly resolved on the wheel that was no longer possible at the end of a reasonably functioning system.