i picked up two legacy Logitech trackballs at a flea market today, and was reminded. A large pool-cue sized trackball is by far a better cursor controller than a smaller-than golfball sized trackball by the same company.
For those who care, $5 apiece for a Trackman Marble FX PS/2 large ball, and a Cordless TrackMan FX USB large ball
I do own the ADB version of the Logitech Marble drawn in the first post. It's fine except when compared with a larger more-massive trackball. And I absolutely hated the marble-sized trackballs on my Powerbook Duos as much as I loved their keyboards. Trackballs should be spinnable with a slow and gradual end of momentum, best provided by massive, large ball on smooth rollers.
Edit;
Ripster, are those red arcade buttons under your left thumb for primary and secondary mouse buttons, and do those mini phono jacks disconnect the trackball clickers when inserted? Wowsa. You photographed that setup earlier on the left of a keyboard, but the photo didn't show the wiring of the arcade buttons