@mahlman
I was in a hifi store and told the owner about isolation, he was at least curious enough to hear if there was any difference.
I put Smalley wave springs (not even optimum for the task) under the best amplifier connected to his best speakers, and he also heard it immediately.
It was when he allowed me to place a set under the speakers after he removed the spikes so that I could show him - that's when he politely excused himself to return with two of his techs who he introduced me to. They sat in there and all discussed the superior sound coming from their speakers they sell.
Opinions vary! I have already gotten positive feedback from Agon users, I believe it's because it actually works. I am not selling any products, just sharing experience.