I've been looking for a new helmet, and am intrigued with the filp up models (KBC FFR, Nolan N100E, etc.) From what little info I've been able to get about these, it seems like they're a bit noisier & heavier than a one-piece helmet. But I love the idea of being able to lift up the chin guard for certain things without having to take the helmet completely off. The couple that I tried on fit my head quite comfortably, but I'm not able to take one out and test it. Anyone rode with any of the flip-ups? Pros/cons?