Ive never had an issue with NAP spitfires, but i only use them once. My reasoning is i spend enough money and more importantly, time, that after i shoot, that broadhead is done. I know they are expensive, like 10 bucks a pop, but when its all said and done, i dont ever want to have to have to question if the head is sharp enough. Spitfires are plenty sharp out of the box, so for me its one and done.