Sorry have not used them. But from using similar heads for years, they will penentrate better than a non cut on contact head. Being that they are one piece they should fly much better than involving an insert.

AS to using them 3 years without sharpening-- thats a tough one. I use 3 blade snuffers and 2 blade Zwickeys a lot. When I hunt a lot I have to touch them up. Even from just moisture in the air dulling them to vibration, to removing and replacing in the quiver.

Sharpening should not be difficult. I never had a problem, but if you can't sharpen a knife well it might be a bit more tricky.

I have one that we found in an elk carcass. From that one sample, I'd buy them if I didn't have a bunch of others already. For deer they should be super. For elk and moose type targets I'd prefer to go 2 blade just for the penetration issue. Its really a toss up though. That 3rd blade could add to the blood trail. And if you shoot a heavy enough bow and arrow combo its not an issue in penetration (3vs2)

I know 2 folks that shoot them and they are really happy.

Jeff