Yes used a few of them, Roy developed them initially for us as the Sieg and the American KB controllers have the pot at mains potential.
Just wiring straight in using the same logic supply as the rest of the breakout / driver system causes lovely bright multi coloured sparks and bangs [ don't ask ]

Like all of Roy's boards I have used, they have worked with no problems and done what it says on the box which isn't hard as they don't come in a box.

.