Unfortunately, the mouse in my coat problems, that it is a very short time totally disgusting greasy and gets stains. In other mice of (whether by SteelSeries or other manufacturers) does not happen so.
The second negative point in my mouse was then that the left mouse button has constantly geknarzt and the right mouse button has vibrates. Overall, it is a very good mouse, hopefully was my one single case.
Still, I'm switched to the Razer DeathAdder, which is still a tick better in my opinion.