Well, I contacted Patrick to try out one of his power cord because the price is very reasonable. I managed to get an Avius SE 6' demo cable to save a bit of money. It's a bit too long for my system but what the heck, I'm cheap and on a budget. Man, these things are huge! They are monsters! I had to move my Odyssey pre-amp out of the cabinet and put it on top to use the thing. My pre-amp is the only component that I have that I can exchange a pc. I was not expecting any change on one pc.
Basically, these are a deal for what you get. The highs are more clearer and more forward. (On my system, it's not necessarily what I want.) There seems to be more soundstage - not only front to back but height too! The bass is fuller and a bit less muddy. Not a monstrous difference but enough to notice it especially on a quick change with the Tempest's standard plug.
For the price, I'd really recommend you try it out. He has a trial period on his products.