I killed deer with both fixed and mech! I don`t know about the horror storys some talk about. I have lost deer with both type heads. one time or another if you bowhunt long enuff it will most likely happen.but i hope it dont! Goodluck, I really can`t comment on what others post only the experience that i have.I have been bowhunting for more than 20yrs.I started useing mechs about 5-6yrs ago. they just sounded to good to be true.a broadhead that would fly like a field point? well i tride them and the only thing that i can say about mech that i have hunted with is that some times you just don`t get as good a bloodtrail as with fixed heads.BUT IT ALL DEPENDS ON WHAT KIND OF FIXED OR MECH YOUR TALKING ABOUT. and how many pounds your pulling.The deer i have lost was most of the time just bad shots! I hate to say it but it is true.there are alot of factors you have to look at when you compaire the to heads.mech`s i will agree are not for every one! but if you set your bow up right and place your shot where it should be.the animale will die fast! But the trouth is we don`t always get the pefect shot. so here is where thing come into play? like others have sead bending around tree`s twisting and other wierd shots that make the biggest diffrence.on weather you get a passthrough or not as for me I will hunt with mechs and i fill confident with them. i have taken some nice animals useing them. but i also take a little more time placing shots just to be sure.But when you talk abount fixed blades there is no doubt they cut a lot faster than mechs and won`t slow the arrow down near as fast.the only reason i switched is it took me a while longer to tune them.getting one to fly right and to do what i wanted seem to take a lot more time than it should. I have shot muzzy`s and thunderheads and they are great and i would not have a problem using them agian. And i may even use them again in the near future.but like i sead bad shots is what is the problem with most people`s lost deer! mechs or fixed!