I've tried a few trackball style mice in my time, and I hated them.

I've known a handful of users who swore by them

But I've only ever sworn at them. LOL.

I guess you'd have to try one to know if a trackball was for you...

I have a mac for Poser and use the Apple Magic Mouse, with touch surface for zooming / other gestures. I like that certainly.

Microsoft have their touch mouse equivalent... haven't tried it myself yet though... but if it works like the Apple Magic Mouse, I would say it's worth considering...

http://www.microsoft.com/hardware/en-gb/p/touch-mouse