im using an old logitech optical=)
as long as its a smooth mouse, with a high resolution, and its comfortable in my hand-- i can aim with it.
And for me, it comes down to how comfortable i am with the mouse more than anything (except i cant stand ball mice)
CS:S Cyberathelete professional league, and FBG scrim wars require me to have a good aim, Fortunately this little Logitech seems to do the trick.
I've tried a few Razer mice, but they always feel clunky in my hand, and i just cant snap and shoot with them like i can this one.