I have used spitfires for years with out a glitch their testimony is proven through the many photo post I have put up in the past couple of years. But understand I woulden't know how they perform on poorly placed shots as I only take only percent shots (brodside or quartering away) and I keep all my shots under 30 yards if I want to shoot 40,50,60 yards I get a shotgun to me thats what bow hunting is all about but to each their own. I say go for it as stated earlier you get a bigger cutting diamater and if you keep your shots at a reasonable didtance you get a pass through 2 big holes=quick bleed out.