I have never used them but the older NAP Razorbacks were terrible broadheads according to the guys on the archery boards. I' m with bigbulls, for $10 a crack you can get a much better head cheaper. I shoot Magnus heads on traditional equipment and they are a great head, easy to sharpen, lifetime warranty and you can get six of them for $22 at cabelas. I just picked up six of them off ebay for $15.