A hunting buddy of mine used one to kill a Hog and it seemed to do some damage.

they do great damage, but they need the blades replaced after one shot. the blades brake really easy.
even shooting into a block target they bend or brake off. But when into a deer they leave a hole you could drop
a golf ball into.

The newer versions blades are much tougher and will hold up to repeated practice without problems. The first generation heads however had very fragile blades that did bend with very little effort.

Again, i would not recommend if you intend to reuse broadheads. Personally, I don't care if I reuse...I just want to put the animal down quick.