Well, amazing results happened in my system:
1) Great increase of transparency/clarity.
2) The soundstage got bigger with more layering.
3) Macrodynamics/slam /jump improved.
This is normally the sort of thing you can only get by with an amp upgrade (twice the power) or a significant speaker/component upgrade.
Here is a thought....just buy this disc for 20 bucks, sell all your high end gear for a song and buy some Tweeter Going-out-of-business sale gear and you are laughing! Better sound and $1000's back in your pocket! What a concept.
BTW I tried the Ref Recordings Test disc by Prof Johnson (it has a demagnetizing sweep too) but I could not hear any difference. Either it is my tin ears or not all demag sweeps are created the same...