$479 from the mfg is not too unreasonable.... especially given the low weight of the thing, and the self tinting visor.
From reading the reviews, the only concern (as with every other helmet) I have is the fit.... I have read it's a good idea for the purchaser to go up one size as the helmets tend to fit snugly. As I already wear an XL in most brands, there's not much range left.
How quiet is this helmet, and what head shape does it suit? What is their return policy?