I was using fixed since I first started bowhunting. Specifically the original muzzy 3 blades and NAP hellrazors. I took a bunch of deer with both heads. Last season I had the biggest buck i've ever seen at 15 yards and I choked big time. I made a poor, non-lethal shot on the deer and he survived. Since that painful experience i've switched my broadhead to spitfire maxx. I havent shot anything with them yet but im looking for a little more cutting diameter for marginal hits, incase it happens again.