I haven't shot an animal with them yet, but they are tough. I shoot them for tournies and leagues. I have over 500 shots into sand and dirt butts with a couple of these heads. Never lost a blade. Even with a few nicks, they are accurate. Can't say that about the other 15 or so brands in my tackle box.
Gary @ Slick Trick is a great guy. Cares a lot about the people who shoot his heads. They come first above all shops. He would rather see nub from WI, buckeyehunter from Ohio, jbra, bigbulls, ruttin, and all other Slick Tricksters get their heads first. Dial that # in the website, and you talk to the man.