I have the Spitfire (not the XP) and love them. My father also shoots them. They work great, but remember that they are not maintance free. I like these as they use the retainer clips for holding the blades closed, but they will lose retension strength every time they are used. They recommend only 5 shots per clip, but for hunting purposes, I will only use NEW CLIPS. If you get the Spitfire, get their practice blades and use them for practice, hits exactly the same as the real blades.

THe blades with rubber bands or O-rings, require more maintance. Rubber bands/O-rings can deteriate in time causing them to fail to hild the blades closed.

Hope this has helped you some.