I haven'tand don't usethe head so can't comment on how they work.

If you get Bow and Arrow hunting magazine Chuck Adams did his article on arrow penetration this issue. He has made no bones in the past, or in the beginning of this article about his dislike of mechanical broadheads. He goes on to say at the end that a slip cam design like the Rage, specifically mentions the head, is different and doesn't waste its energy on penetration, won't cartwheel and penetrates very well. He had nothing bad to say about the head, pretty sound endorsement there.