I shoot 65 out of my Allegiance, coupled with its speed mods, in case I accidentally smack a big shoulder bone on a mature Illinois brute...

Do I need it when the shot is absolutely perfect? No way. The fact I had to pull eight inches of my arrow out of the dirt after passing through that big mature doe Tuesday night tells me that -- and that after some of the KE was used deploying a big inch-and-a-half mech. But I'm a lot more comfortable knowing all that KE is there if I'm off in my shot placement a touch.