Well, this may sound totally of-the-wall and dumb, but I've heard the "intelligent disc" and - dang! - it DID sound different, and slightly better in many cases.
It was perhaps a year ago. My favorite local dealer was doing a demo. He had some Kubala-Sosna cables, Crystal cables, Soundstring, and some just-burned-in JM Labs Berylium-tweeter floorstanders in.
The demo was primarily to compare the cables (we all liked the K-S the best, they are freakin' outrageously priced though), but the dealer pulled out the intelligent disc later in the evening, when we had settled on the cables.
We played perhaps 6-7 discs, same tracks, before and after the disc treatment. Reference Recordings classical and choral work, some vocal jazz, some great folk, and more I don't remember.
I will tell you that ALL the people in that room that night thought the disc was a bogus piece of marketing snake oil crap.
And I will tell you that we ALL agreed there was a difference on almost every recording we heard. Sometimes it was subtle, but sometimes we were able to easily pick someting out that was "more defined," more transparent," or "less harsh."
4 of the people that night were ready to buy that stupid little disc. I considered it, and probably would have grabbed one if he had it in stock, but held off since he didn't.
I know it sounds unbelievable, and I really didn't want to believe. But we had unanimous agreement SOMETHING was going on.....and in general, we liked it.
I doubt I could hear the change on my system - the store had some beautiful Hovland electronics with an Electrocompaniet CD player - but on a very revealing system, who knows...?
All that said, I'm NOT spending $200 on the box