I have the STS system on my Allegiance. It deffinetly was worth the money for me. It didn't make much of a differance as far as shock and vibration, but that is hard to judge as it was so shock-free! It did quiet the bow substantially. I took the string silencers off and it is quieter than with the hush kit. It does make a THUD noise that alot of guys hear, but I had my buddy shoot it as I stood to the side and it was incredibly quiet!