I've seen these, don't think I'll be spending my money on them. With that much blade grabbing meat, and a punch/cut design, you better have a he11 of a lot of energy behind one of those things to get the job done. That's a LOT of broadhead to push, and as you mentioned, it's none too easy to sharpen. That thing is going to grab meat and slow itself down FAST - if you don't have the power to push that much blade length and "compressing" meat through the animal, then you don't need to be playing with these. Even pushing 325fps+ out of rather aggressive bows, I'm not sure I'd be willing to take that risk.

Quite likely to be 'less-than-aerodynamic' too. Not saying they won't kill deer, but I'm not sold on any dirty science that these would be better than any other blade in the game.