Not much real info. here !
But I tried the NAP for about five minutes. It has about a 0" set back, making my current arrows 3/4" too short. And it was a little noisy and has some unwanted vibration.

I decided to go with a QS Deluxe Wisker Biscuit !

Haven' t seen the Muzzy , but I have heard it requires a fair amount of modification.(?)