I've been using Spitfire 100 grain for over 10 years and love them. Never had one open in flight and every deer I have shot, with the exception of one, was a complete pass through. They produce great entry and exit wounds. You don't have to worry about o-rings. They are also durable. On several occasions I have killed a deer and cleaned and sharpened the blades and killed another with the same broadhead. I wouldn't try it three times though. Of course that won't happen every time, but they are great broadheads.