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You got me. I decided to take advantage of this offer. I emailed them for the free test products, all I had to do was send in $39.99 for shipping and handling - I think we can all agree that was a bargain.
For the blind listening tests, I decided to try all of the attachment methods recommended on their web site:
"BlackDiscus devices are attached to strategic locations on your audio system. We use Blu-Tack, but you can use tape, velcro, cable ties or anything else that does the job."
This is where things got interesting. I found the Blu-tack really brought out the mids, as did the double sided tape (Scotch brand worked best). Cable ties worked pretty well, however you need to take care to ensure that they're really snug. However, I did not have good results at all with the Velcro. I found that it introduced 'scratchy' sounds to the upper mids, which was especially obvious during the many times I tried to reposition the devices.
All in all, this is money well spent. I'm in the process of placing an order for a few dozen more. Out of curiosity, I tried placing one on the power cord of my Internet router, and my speed jumped from 3mb/s to 5mb/s! Encouraged by those results, I moved it to the washing machine, where my whites came out whiter and my colors came out richer (although again, with the Velcro, I noticed some pulls in some of the finer fabrics. I really cannot recommend using Velcro with these devices).
Hope my real world experience helps others decide to take the plunge!
bs