I'm wondering the same thing. They put a deer on the ground quicker than anything I have seen so far. And they seem to out penetrate the older "over the top" expandables like the Spitfire. I have also noticed that some of the celebrity bowhunters used them on African plains game with good results.

But torture tests done by people like 5 Shot suggest they are not as tough as heads like the Montec or Hellrazor. I'm planning to try them this fall on elk - but also planning to carry both types of heads in my quiver, since they all shoot to the same spot. For bear, I think I would just stick to the Montec.