I overshot the landing on a jump, dropped about 20' to flat and slammed the back of my head. I hit so hard the back of the helmet split (they are supposed to so that they absorb the impact) and I walked away without a headache. I have no doubt this thing saved me from a concussion and possibly my life.
Otherwise it is a comfortable, warm yet well ventilated, and well priced helmet. I will definitely be buying another.