I've tried quite a few different mechanical heads, but only for turkey hunting. I've never tried them on deer. This year I tried the Innerloc EXP and I absolutley loved it. Devastating is the only word I can think of for it. I tried it because I was tired of O-rings, which it doesn't use, and you can change the cutting diameter by flipping over the collar. If you want more penetration for deer, you can go from a 1 7/16 cut to a 1 1/8. I think WASP has a mechanical that does the same, but you still have to use O-rings. What else is nice about it for turkey hunting is that with the type of blade deployment system (clip-lock), if you are shooting through mesh on a turkey blind, you can click the blades back and shoot it like a fixed blade through it and the blades stay locked back. I actually shot my second turkey with it on a stalk, so I had them undeployed and it almost tore off the entire wing at the joint before passing through the tom.

Give it a look, you might like it. I hope to take a coyote with one during deer season to see what they'll do on a littel bigger animal.