My professor, for whom I do a little research in between classes at college, put those on several of the lab computers, and i hate them! It’s slow! I didn’t change the settings for speed in the control panel, so I could probably make it so it moves faster, but still, you can’t induce as fine a difference between a fast motion and a slow motion with the trackball, as you can by jerking your wrist.
I can’t stand trackballs either. I just use a Razer mousepad. It’s wide, 16:9 or so, and gets the job done. Now where are the ergonomic keyboards? I need something to replace my old Microsoft natural keyboard, but the keys on all the new ones feel ‘mushy’.