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I thought we called these ball mouses. But anyways I don't think I ever used one or if I did it was a very long time ago. The ball is handy if someone is annoying you, you can just throw it at them.
I like how heavy they are. They aren't too bad to daily drive, you just have to take the ball out and clean it every few months. They definitely can get more nasty than optical mice though..
I have a Dell one for my windows xp setup, it's alright even though it took some getting used to for Half-Life. If there's a ball mouse I would get it would be the Corvette mouse