I've used the Hammerhead. Kills turkeys dead, and my second arrow into my buck wasa Hammerhead....Pretty wicked.I will say though, at a distance of 18 yards, right through the bread basket...No complete pass through. Buried up to the fletching, sticking out the other side, but still in there.

The thing I REALLY don't like about them.....when the blades sweep back they cut into my arrow....I've got 3 notches in it, rendering it useless.