I am a trackball user and I have been looking for something to replace my old wireless Logitech Trackball Pro. It's good but failing slowly.
I just ordered up a Kensington Expert Mouse Pro, another wireless trackball and I'm pleased I found it. They seem to be rare.
http://i.ebayimg.com/00/s/ODYzWDk4Ng==/z/EhAAAOxydlFSzy9Q/$_57.JPG
A bunch o' buttons, I am pleased, been looking for a while.
Anyhoo, what do you use. Mouse. trackball, controller and how do you line up your 5+1 in your regular setup?