OK, then:

I have one pack of the Saber SS that I bought to see what they were like. They do look like Muzzys in a way. The blades are thicker than Muzzy blades, but were not sharp enough to hunt with out of the pack. The blades are retained by a small extension tab at the back. It looks adequate. The heads themselves did not spin as true as other broadheads in my arrows, which with other heads (Muzzy included) seemed to indicate that the inserts were aligned properly. These heads seem adequate if you take the time to sharpen them. I personally would prefer Muzzy, Thunderheads, Wasp, Rocky Mt. to the GT heads.