I am not trying to say that they don't do anything at all to deaden vibration just that for what they cost in R&D, machining, installation, etc... that a string leech is a whole heck of a lot cheaper and is far more effective.

They do work to some extent but the cost is certainly not justifiable when you look at the actual performance returns you get from them.

IMHO they are another marketing scheme. And I am not bashing Mathews. There are other bow companies that use similar products on their bows.