This year I switched from the 100 gr. 3 blade Muzzy to the mechanical opening NAP Spitfire. Tuesday eve, I shot a nice 8 point, with a 20" spread, @ 20 yards from 15' up. A buck I had been waiting on for some time now. Bad move on his part, he finally made the mistake. But anyway, entrance on the left side behind the shoulder the broad head clipped 1 rib. Exit on the far side, it center punched a rib and cut it completly in half. The arrow was hanging out the far side by the fletchings, after he took 2 bounds the arrow fell free. Buck went about 60 yards and piled up. I was amazed at the hole in cut on the exit side, I believe it must have pushed some rib bone thru with it. Although I won't use those blades over, they looked no worse than a new set of blades, none bent or damaged. They fly like a target tip also. I was very impressed with it's performance. Any of you guys use them, pro's or con's. T.