I just got back from a weekend @ Aaron Stevenson's Cornerspin in North Carolina where I spent two days riding a tiny (100cc) bike around a number of track configurations. Those guys are legit. Not only was it an absolute blast, but the level of instruction and content was some of the best I've experienced and I have no doubt I'll be a better rider for it. I'm looking forward to hooking up with those guys on the track for Cornerspeed.