Group riding with tandems is pretty cool. We like it. Rollers are especially fun. Singles make a hash of it. We either have to wait for them or they have to be really aggressive wheel suckers, which isn't that much fun for us when the tandems are working hard together. If we can get rid of the Klingon they're usually gone, at least until we come to a long climb. Not too many singles are interested in the 600 watts thing. The trick is to be nonchalant, then accelerate hard just past the crest. That usually catches them by surprise. Once they're 20' back . . . If they can come back up, we usually don't mind, because that means they are at least competent and might stay out of our way.