Hi Cliff. Robots Live currently don't allow spinners in their arena. As Sean said, Extreme Robots allow spinners, as do Robochallenge at the featherweight championships (but that's only one event a year). If I were you, I would look at the event calendar, see what events you can get to, and make a decision based on that. You wouldn't want to build a spinner only to find out you can only get to Robots Live events.