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I have the black version of this trackball, and used it for quite a while. It's nice enough, but I have since upgraded to more industrial trackballs with ball bearings.
Keep in mind that while this is optomechanical (quadrature) it's still got enough DPI for most uses. I would say the counts per revolution is more important, and with the 2.125" diameter ball it's good enough.
It has POM sleeve bearings which pale in comparison with ball bearings, but are quite nice when compared with a "normal" consumer trackball.
I would recommend replacing the ball with one from a pool set for aesthetics once the original ball gets scratched and used.
What model are you using now?
Could you please let us know what you reccomend? :)