It was okay. The problem was mouse acceleration. I'd move the mouse (actually my hand on a trackball) in a circle, but eventually the path of the pointer would wander and I'd have to lift and move the mouse (take my hand off the trackball) to try to get my hand circle to correspond to moving the pointer in a circle inside the gaming window and centered around the center of the window again. Hard to do in the middle of the game, and runed the gameplay.
It probably would get a little boring after a while, but I never got that far. I got too frustrated and had to quite.