I have shot both a fixed type prong rest (Golden Key) and I now shoot a muzzy zero effect (fall away) I like it a lot.

BUT do I notice any difference, Well in a simple answer no. But what a fallaway does is allows me added clearance if I want to shoot a hard helical fletching.

Since I fletch a lot of my own arrows I play alot with different veins and vary from staright to pretty radical twists. With the Muzzy I don't have to worry about fletch contact.