Very good!
Good mouse, no problem, 6 levels of sensitivity, it's nice and the mouse changes colour at each level! So 2 little points I'd like to point out: the burst button on the mouse, which actually allows you to shoot a burst in a fps... Well frankly it's not useful, but since it's a plus it's not really a problem haha.
The second point is a bit more annoying though, while looking at the reviews I saw someone say that the mouse detects the mouse pad at 1cm and that in games where the mouse is raised to be offset it's a bit annoying. He was right, well personally I don't really have a problem with it but for those who really try hard it will be annoying. So it's a good product if like me you don't mind this detection.