Surely the Acid Test is to see what the Race Teams use.A Helmet used in an extreme environment will need to perform at the highest end of the protection spectrum.And don't throw the "Well they get em free" argument,because Mr Rossi and the rest would not be putting their heads in a free helmet from "Fred Farnsbarns" if it fitted like a bucket,had an ill fitting visor and had interior foam like souffle.
Have you seen Top Racers using Budget priced helmets?
i think Anthony West of MotoGP Kawasaki wears an Airoh - am I right???