Brave man, McGowan...

You're right he is a brave man, he just told the world that his $9999 AC regenerator is a POS.  
I can go along with the idea that any cable carrying signal can and will make a difference (some kinda difference).  But an AC cord is where it stops for me. Unless you're going to rewire all the way from the power station. 
Flame suit on!

" Nothing matters ———-/——-> Everything matters"

"Everything is good 'till it ain't"  Tony Soprano

In browsing through the thread I see a few people mentioning component noise so I am wondering if the cables are filtering ac noise.  To me that means the component is flauded and some of the change for the cable is doing that which would explain to me a quieter background more dimension more details,etc.  So I am left wondering how much of an improvement would those cables have on components that already filter nose much better?  I know that may only be part of the equation.  I just began installing Pliton torodial chokes in my components and that is the change I  hearing for a $400 part.   Happy listening

No, cables and power cords are not filtering AC noise. They are oft shielded against external noise of the RF variety but any noise on the AC comes right in along with the audio signal. I am not making this up and I didn’t invent reality. Not to mention there are other types of noise from many sources including the noise coming right through the windows and noise generated by microprocessors as well as magnetic fields. I don’t use cables or power cords personally so I actually don’t have a dog in this fight. But I do know there’s no substitute for Signal to Noise + Distortion Ratio.