We try to stick with just Yamaha riders. But I think there may have been a couple riders (very few though) of other brands that infiltrated the group on one day. But they all had there own tow ropes on the front, think they were factory installed...hahaha. Just kidding. I myself say let's stick to Yamaha only. But keep an eye on the post on the RX/RS forum, as I'm sure the topic of "I have a brother or a friend, but they ride Polaris or Ski-doo, can they come on the ride?" will definately come up (and I did not mention Arctic Cat on purpose..hahaha). Keep an eye out. Brand loyalty thing I guess, and dont want any of the "My brand is better than your brand" arguments.