Well, installed my Betson Imperial 3" I bought 2 years ago into my panel finally (yeah, it's been on the shelf for almost 2 years, lol), and it no-workie. I'm pretty sure the board that converts the encoder signals to PS2 is fried. I'm looking for either another Betson 3", or a Happ USB 3". My current one has a 3" clear blue ball, which I'd assume will work with either another Betson, or Happ.
I'd also consider something like a optiwiz & a regular arcade trackball, or even a turbotwist2 & tb combo (I'd REALLY like that

).
Just let me know what you got and we'll go from there

.