In the beginning I had the ROCCAT Kova quite small before, but it has a very good size (if you're not too big hands). The optical system is also very appealing, especially the lights on the sides. The sensor also works always perfect (on Razer Sphex), ie no jerking. The mouse buttons have a good resistance so you very rarely, a pressed accidentally. What I but (for me) find not so good, that is not a driver is supplied. All settings can be set using the buttons on the mouse (DPI, lighting effects, ..), but once you have the right settings, this is not matter anyway.
Despite the lack of driver the Kova has earned 5 stars.