I've been using the Logitech Trackman Marble Mouse for years.

Now I'm looking for a trackball with a scroll wheel, larger and heavier ball, and preferably rollers instead of pins. It must be finger (not thumb) operated.

The Kensington Expert Mouse is close, but from what I've read the scroll wheel is poorly implemented. They also switched from rollers to pins.

I bought a Kensington Orbit Trackball and it's not bad but the scroll wheel is rough and the ball is the same as the marble mouse. I'm still looking for something better.

I found the L-Trac and it looks good but there's little info on the web.

Has anyone used it and can provide their impressions?

Or can you point out another option?