I was using a Logitech Optical Track-Ball. I used to use it as mouse-look in my left hand, joystick in the other, for CS and it was a killer combo. But using it in MoH right-handed it was too jittery. I never realised how bad it was, but the cursor was all over the place. It's not that the track-ball is bad, just that one's fingers are always resting on the ball whilst firing with the mouse button and every tiny finger-twitch is picked up by the optics.
The wireless one is rock steady and precise as a laser beam.
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