This mouse is only good for skinny guys/kids with small hands. If you are not skinny then dont buy it, because you will be so annoyed of playing on it(your hand will be wet after every round, because you cant grab it comfortable and stuff, owners know what I mean).
I prefer Deathadder, Microsoft Wheel Mouse - very good mouses.
yes, i have qck mass and kinzu and my gameplay has changed a lot!
and for those who says that its too small or smth- i have large hands and while playing hardcore you forgot about about size of your mouse.