Im going to use them this year. I have practiced with them a good amount so far. I can tell you they fly like field tips all the way to 40 yards and they are the sharpest head out of the box that I have ever seen.

Oh....seen the head on a test sight that passed. They made a moch shoulder with phone books with a piece of laminated plywood in the middle of them. The magnus stinger got one of the highest scores for durablility, penetration and flight accuracy.