Well, I've used the knock off heads that are just like them and have had decent results. I've killed several pigs up to 130lbs with them. I have gotten a couple of passthru shots but on the bigger pigs they just barely punched out the other side. Blood trails were good and I felt the heads did their job. That said there is a guy in our camp who shot a nice buck this year with the real deal (Rage brand). Hit it back in the rib cage. Solid liver shot. But the exit wound was small because both blades had broken on the rib going in so the cut width was about an inch or slightly less. We found the deer with a grid search because the blood trail was non existent. When comparing my knock offs to his brand heads it was impossible to see the difference but I've never had one bread and I'm shooting into rocky soil so when I get a passthru the head has bent but not broke. And since the knock offs are so inexpensive I can handle them being one and done. Because really, even the brand names get destroyed hitting that hill country rock.