Yeah, that's the mac mini running both monitors.
As for the trackerball, it took a while to get used to (maybe a week of persevering), but I'd never go back to a mouse now. Way easier to use (my MS Paint skills improved dramatically as its much easier to draw).
I wouldn't recommend to anyone who likes playing mouse based games. Using that you will be shot in the face 30 times before you return fire. But for browsing, drawing and general use, I'd recommend. Especially for long periods. Very easy on the wrists and fingers. As I say, very accurate, but you can't slew it across the screen really fast to kill a bad guy.