We have been using the spinner as part of our handgun matches here in Las Vegas. We know it's not a legal USPSA target, but we are shooting Level I and are playing with ways to score it that could someday be used in a "sanctioned" pistol match. The main goal is to score it so it will benefit those that can, but not heavily penalize those that can't resulting in a stage that could potentially destroy the overall results of the match.
I think this is one of the funnest targets and most practical targets ever designed to shoot. We even tried man on man with two spinners , allowing you to stop your competitors from spinning if you dared BTW, if you try that one, make sure you bring a case of ammo to the line, you might need it LOL!!!
I sue it to practice transitions, setting up a IPSC A/C zone steel 10 yards to either side of the spinner. The routine is engage the spinner (top or bottom plate, no max on rounds), transition to one of the a/c for 1 shot, back to the spinner (obviously opposite what you started with again no max on rounds), then to the other a/c for 1 shot. Keep this up back and forth until it spins. The only rule is if you miss the spinner plate, you can't transistion again until you hit it, and you can't engage the opposite spinner plate until you hit the a/c. This has been a great excercise. My best doing this is 9.63 shooting an open gun with a big stick, no misses on the swinger and no reload.