The GRS Trackball V2 is an industrial-feel LED trackball with adjustable RGB glow and high-precision tracking, connected over USB with no soldering. It drops into custom Pi and PC panels and serves as an upgrade for Arcade1Up Atari 12-in-1 and Centipede cabinets — note the Centipede Legacy unit needs the TS-UTB-PRO instead.
For trackball games, this is the difference between playing them and fighting them.