I've heard the Acoustic Revive RD3 Demagnetizer work with my own ears on my own disk. The really odd thing was that my disc was CD-R, no metal in it. But it sounded noticeably better.
http://www.acoustic-revive.com/english/rd3/rd3_01.html
Here's the Bedini Clarifier:
http://www.bedini.com/quadribeam.htm
I have used, and been very happy with, the Bedini UltraClarifier for close to 10 years and I hears all of the same types of effects that have been described in this thread as attributes of discs treated with the RD3. Having not heard the RD3 directly, I cannot comment on the magnitude of the changes on discs treated by each unit, but the changes themselves are similar in nature (and the Bedini is 1/4 the price.
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One thing I can say is that the 5 second cycle time of the RD3 sounds really nice. By the time the Bedini gets up to speed and spins down you are looking at close to a minute. While this doesn't sound like much when we are just talking about it, it seems like forever when you are standing there looking at it.
Charles,
If you can get access to the RD3 again and want to do a side by side comparison with the Bedini, you can always borrow mine. Just give me a call.