Slimblade Trackball
The Kensington Slimblade Trackball came out in 2009.
This is one of the better trackball loved by the trackball users community. Featuring large ball, and 4 large buttons.


Ball Size
Ball diameter: 55 mm.
Buttons
The 2 buttons on the north side are harder to reach. The buttons near you easier to press, by thumb.
Twist Ball to Scroll
You twist the ball to scroll, like rotating earth. It's awkward. Not the best.

Work in Linux?
Yes. Works in Linux out of the box.
- Lower left button is left click.
- Lower right button is right click.
- Top left button is double click.
- Top right button is browser back button.
- Twisting for scroll also works.
You can remap mouse buttons in Linux using xinput
.
[see Linux: How to Swap Mouse Buttons]
Slimblade vs Expert Mouse

Of all web reviews, there's no consensus of which is better. Some prefer Slimblade, some Expert Mouse.

Slimblade vs L-Trac Trackball
Trackball Size Comparison

more: Trackball Size Comparison