I've only been shooting for the last 2 years so be kind. Does anybody have any type of data showing how much more KE is required with mech's? I see people complain about other stuff slowing arrows down and they are usually talking about a couple of fps which doesn't seem like enough to be the deciding factor. Also, if the mechs are so hard to open, why do they even bother with the o-rings on some of them? I have some mech's that if I hand push them into my target block they open up. I haven't shot long enough to be a good judge, but so far I like them and I have seen a lot of guys on here who have taken some really nice deer with mech's. It seems like the bottom line always comes back to use the equipment you are comfortable with, properly set up with, and most important - take a good, ethical shot.