I'm beginning to think that it really must depend on the bow. From all the posts I've read, it seems to work very well on VFT or parallel limb bows. For my Darton, it most definitely makes a slap/thud/pick your description. From my perspective, it makes the bow louder, but does take vibration away. If I could have someone shoot my bow and listen from a different place, my opinion might be different. The other issue I have with the Darton, that you wouldn't have with the Allegiance is that the power cable must rub against the Limb Saver button on the draw if I set it so my string hits the middle of the button. The Allegiance should have much less cable travel, so I doubt that it would be an issue. Both of my current bows are quiet and shoot well without the STS. If you are interested in trying one at a reduced price, shoot me a PM.