Not a Muzzy shooter BUT they are excellent heads & why anyone would want to take the chance of a malfunction due to something not moving is beyond me. I've been to MANY Camps where i've seen a lost animal due to a mechanical (more than 1 type). Enough to know I would not want to take the chance even ONCE.
I shoot a 3 blade fixed Rocky Mountain that is very similar to the Muzzys. Good Luck. i don't think you'll be sorry.