SK23 ; I have a Barnett quad 400 150lb. I also shoot the spitfire mechancials with great results.never had a problem.only thing I have to do is resharpen the blades.had a couple bent because of hitting a leg bone.two into the backbone.

Barnett is a good xbow IMHO and cost quite a few $$$$$ less.great warrenty.
I always use the same head to pratice that I do to hunt.with the spitfire you can get pratice blades.