Michael take into consideration while this is a cool new helmet... If you do anything that requires a replacement part, it will be hell. That visor for example because it can be darkened with the push of a button, if it got scratched or dropped by mistake.. how much would a new one cost? Where can you pick up a replacement? How soon? I personally would not purchase a helmet that I can't try on my head first...
Other then that, unless you see it in person you don't know how "Cheap" that helmet is.. for $300 bucks it seems too low of a price compared to some of the other helmets out there with similar technology, usually upwards of $700 or more.
Either way if you do decide to get something like that, I'd love to hear your review!!