Been shooting Muzzy 130gr broadheads for 20 years now and have never had one fail. Have never had a problem with arrow flight. But I will say I have friends that have the lower weight Muzzy broadhead in 3 blade and I am not impressed with them. The thing I have always like about Muzzy is the blades mount from the front. I have seen to many rear mount blades be pushed back into the arrow shaft. One of the reasons I never went to Thunderheads, another very good broadhead. The other thing about the Muzzys I use is the 1 1/8 cut, has always left me a very good blood trail. If the ST is a better broadhead and enough really good people are saying so. I may get around to shooting them, but that will be a while because I have 30 Muzzys left. That is a few years of hunting before I need new ones.
Gselkhunter