I've attended his/HFC demos and heard his system at shows for several years. I've also heard bizarre statements/contradictions by him like "I don't make balanced cables because it's impossible for two conductors to be identical"....and then the next year when he started selling balanced cables, I remind him of what he adamantly said the previous year, and he gets a perplexed/nervous look... dead silence... then claims he can't remember saying that.
I also watched him focus light from a certain bulb with a demo magnet while implying that the same thing happens with the signal in his cables. It's sheer folly, but seems some people in this thread actually believe him. Obviously they didn't know the two simple questions they could have asked to prove that it doesn't work like he implies.
The first thing I asked him to do was take that powerful demo magnet that was bending light in a bulb (and that he said was more powerful than the one in his cable) and, instead of putting it up to the light bulb, put the magnet up against the dinky unshielded power cord connected to his projector being used in the demo. If that super powerful demo magnet was doing the same thing with cable signals as he was implying with light, then the magnet should pull the electrons away from the power cord and either shut off the projector or at least dim it. Guess what? The magnet did nothing to the power cord. He actually proved to himself that his analogy was sheer folly. I didn't have to say a word.
I won't go into the second question I asked him, but you can figure it out yourself if you know how magnets work and see the difference between the power plug things he sells which he implies can go anywhere to help, yet listen to him explain how important it is to place the magnets precisely on his ICs.
Like most snake oil, you don't have to even argue or debate science. You can just listen carefully to what they say... ask logical questions... and they will shoot themselves in the foot for you.