Cool video! I recently acquired an Atari 2600 "Pro-Line Trakball" which seems to be different than the one in the video, in that its housing is all-brown instead of brown/white. It also lacks the switch for joystick/trackball mode, though the spot for it is there. At the moment, it only works left/right, but gives no response on up/down. Hopefully, it's a relatively simple fix, since it should be cool with Missile Command and whatnot.

I also have the Roller Controller for the Colecovision, along with Slither. Haven't done much with it yet, but it seems to be all there. Interesting that Coleco came out with it (and the Driving Controller) as Expansion Modules, yet didn't do much with them.
-Adam