I can certainly echo BobM's skepticism on this one. For me, it plays directly at my system's weakness. My room needs treatment but my ever so sweet wife ain't gonna let it happen.
So Synergistic Research comes along with a magic bullet (literally) at a price that, while not trivial, is certainly reasonable compared to other room treatments. (well, yeah, $300 per pack of 5 little aluminum thingies seems a bit excessive). Most everything I read says it works and people that I respect say the same. But, I'm an engineer - WTF? How can those things make a significant audible improvement?
For quite a while TheCableCompany was offering a completely free 30 day trial - free shipping both ways if returned. Not sure if they still are. But bottom line - the only way I'll be a believer or remain a skeptic is to try it. Perhaps I will one of these days.
Anyone else try these?