[melling]

I have the Kensington Orbit and a Logitech Marble. While I love the scroll wheel on the Kensington, I find that the left button requires a bit more force than the Logitech when clicking. No such thing as a gaming trackball?

http://www.logitech.com/en-us/product/trackman-marble

[digikata]

I still miss the Logitech Marble FX (out of production) http://www.amazon.com/Logitech-TrackMan-Marble-FX-Trackball/...

But it would be a terrible 'center' trackball.

[semi-extrinsic]

I use a Marble FX at home, they are wonderful. Hope it never breaks. At work I use an M570 which is also quite good (thumb-only trackball).

[randlet]

Interesting. My one complaint about the Kensington is the buttons feel a little flimsy to me. Not sure I could live with that Logitech without a scroll wheel!