Bowhunting World or Bowhunter did independent testing on a bunch of mechincals last month, including the piston point. Did not fare very well when shot through concrete and plywood. Great concept, but the dureability of the blades was questioned. In my personal experience, if you hit the animal in the vitals and no solid bone contact is made, it is a good head. I would stay away from it though for the chance that you make solid bone contact.