I use an Intellieye at home, love it to death. No more cleaning crap out of the ball. As a long time CAD draftsman (15 years) the best is a tablet. 16 programmable buttons (64 commands with shift and such) plus whatever you put on the tablet menus, you can't beat it. For all you guys with carpal tunnel, the real key is your work area. Get rid of that desk and make yourself a real CAD station. Built mine for $30 (one sheet of 3/4" plywood and 5 "2 x 4"'s). E-mail me and I'll send you a set of plans if you want.