My experience hasn' t been as good as thoose mentioned above with the spitfire. I think the new Scorpion that NAP just came out with is a big improvement. I also think the NAP Shockwave is a better head. Of course this is my experience, I always say buy a couple of packs of various heads, shoot them, and then make up your mind.

My biggest problem was penetration which seemed to be a byproduct of their blade retention system. I know 5 Shot has done tests on them and found similar results. I will say this, the quality of the product is A+ as most things NAP puts out are. I do know a lot of people who swear by them so that is a very positive thing. I do think the Scorpion looks like a winner and I would look at it first out of the NAP mechanicals.