There is a lot of Razer hate in this thread. I currently use a Razer Naga and I prefer it to my old logitech G5, it feels way better in my hand.
My guess is that it is all subjective. When looking for a mouse you should first figure our how you hold it in your hand, do you use a palm grip, or a claw grip? When you know this it will be much easier to find a mouse that suits you.
You should no matter what brand you end up getting, get a so called "gaming" mouse. They are more expensive but definitely better than perhaps a comfort mouse.
Did the Quen spell get nerfed? I see a lot of people saying you have to use everything in you arsenal but when I played through the game on Dark difficulty I just used Quen and ran in with my sword. Also rolling is a good thing.