I said this a couple of times on this site Experience sells there helmets to small. There should be some movement of the helmet and no pressure points. You need provisional help with helmets but this is not available in NZ. What I have seen is most will look at price and not quality.
This interests me as the injury this system is designed to reduce or prevent, is the same as I experienced in a recent off. I don't want to go through that again and would be keen to get me one of these.Slak