Yea, I feel it coming. Maybe this isn't a bad idea after all.I'm using one of those at work, to try and prevent future carpal tunnel.
We have a kingston kicking around here. One of the old Graphic Artists used it. I freaking hate it tho - just feels unnatural. Was a huge PITA using it with photoshop (for me at any rate)I prefer the larger trackballs like the Kensington Expert Mouse or SlimBlade
I've used the smaller ones, but they just feel flimsy. With the bigger ones, you get a bit of "inertia assist" to keep the cursor moving. And they just feel more accurate to me.
And i HATE those thumb-ball mice.