It's sooooo difficult to know which helmet manufacturer to trust with your head. We all "know" that Arai, Shoei and a few others are exemplars, but that is just an opinion, not necessarily based upon actual fact. Yes, there are reviews, but do we really trust them to be totally impartial? Yes, we all know someone who crashed with a "XXXX" helmet on and it saved his life, but does that mean it's one of the best and will save you in your crash?
AGV, HJC and many others sponsor Moto GP, WSBK and other riders so you'd imagine that their helmets would be superb but the racing helmets provided to the elite classes are definitely not the same helmets we can buy on the high street, at least not at prices we can afford so how do we choose?