It's not just about space (though that will be an issue); I've been wanting to give one a try for a while.
I am curious to try one, but pretty sure they're overpriced for "enterprise" 3D places, and wouldn't have enough benefit for regular use to justify it.
Since I'm already ordering from Scan I can save on delivery if I get a similar looking one by Speedlink (the only trackball Scan have):
Is a new product though and can't find any reviews. Other speedlink products get reasonable reviews though, so I'm thinking I'll probably go for it...