Well the problem is, I have friends who swear by them and some who hate them, the pro at the archery shop recommended them said it is what he uses and never had one fail him so I bought them. I reckon I will find out. I have seen the wounds on some of my friends deer with them and they were impressive. Since I have not picked up a bow since 1976 and was using bear razor heads with the insert, I am pretty far out of the archery loop so I figured I would listen to the pro at the shop.