A buddy of mine shot them for 3 or 4 years. He killed several deer with them. I was there for many of the kills and my assessment is this ... the expandable blades are pretty flimsy and, more times than not, 2 or all of them would shear off somewhere on or in the deer. Penetration didn't appear to be an issue, at least on whitetails. He was shooting a Hoyt with Command Cams at about 65 lbs using 2314 aluminum arrows about 30 inches long. Lethality was not a problem, but a good hit is a good hit and a marginal hit is a marginal hit, no matter what broadhead you are shooting.