miked1, I shoot Muzzy 115's. Got nothin but good things to say about em. Last year I tried multiple broadheads and have decided that Muzzys are the way to go. I shoot four blades for the simple fact of having that extra blade. I don't think it's going to make you or break you either way, just what I like. And from my experiences, a heavier broadhead will penetrate a little better, assuming you're shooting enough KE. All around, any Muzzy you shoot will perform for the most part, but I do prefer four blades and a little heavier head.