It's one of the few helmets that is a completely aero molding, whereas others are a pretty standard mold with an aero shell over them. The Limar is more structurally sound in the tail area. I don't know much about the aerodynamics, but that would change from person to person anyway.

I just bought one of these online for way cheaper than they seem to be on ebay, so when I get it, I'll let you know what I think. PIMA, maybe you could write a review about it, once you've put a few miles with it on. Its going to be a couple months till I'm riding (maybe 1 -- we can hope, right?)