I do have one. One of the few on this board.
I will however recommend for the money, go buy a good disc or the like racing clutch instead. They are easily adjusted and typically have interchangeable sprockets and weights. There are a bunch of racers that use that type, parts are aplenty and they are still in business.
It's a interesting piece, That was a hype to jump on.
Iam not really interested in selling mine just yet. It might be on another actual minibike project (hopefully in the new year).