I was skeptical but willing to give it a try
Crutchfield Customer Review (What's this?)
I was skeptical, but two audiophile friends strongly urged me to try them, so I figured I had nothing to lose with a 60 day return policy. I started with a pair of stands for my Harbeth SHL5. I ordered the sub stands because they provide a larger base for the Harbeths. The Harbeths were already sitting on very rigid shot filled stands, so I wasn't expecting the ISO's to make an improvement, maybe even be detrimental. At best I was prepared to perform extensive, lengthy listening tests looking for subtle differences, and questioning whether I was hearing any differences. As soon as I added the ISO's, it was one of those jaw dropping OMG experiences. There is an online video from the company that demonstrates the effects of using the ISO's, and my results correspond - improved clarity, larger deeper soundstage, and tighter base. I immediately ordered a third ISO for my subwoofer, and heard another layer of improvement. At this price it was a no-brainer.
Pros: Improved clarity, wider and deeper soundstage, tighter bass.
Cons: I raises the height of the speakers, so the adjustable stands might be required. They don't improve the overall appearance of the speaker/stand setup.