I trust and beleive in helmets and I will never ride my bike without one. I truly beleive that a helmet will protect my head in most accidents but that is no reason to sell them so expensive. I'm using the Gyro E2 I didn't know that Gyro will replace my helmet if it get broke on an accident.

By the way ventilation is really good with this helmet but I fall once and I get hurt by a tip of a branch that pass throught one of the holes.