I have not found "revolutionary" improvements with high-end power cords. Subtle differences - yes, and I perceive them to be improvements in my rig. I think it depends more on the components internal power supplies and other factors, like how much garbage is on the power lines in your house, noise on the circuit, RFI and EMI, etc. However, I have been a fan of PS cords for quite sometime, simply because of their robust construction and the prongs and contacts of the ends. Nobody, and I mean "nobody" that I have ever found makes milled from solid billet prongs, welds the wire to the contacts inside the plug and then vacuum molds/seals/encases it. I don't care if you're buying Oyaide, Furman, Marinco, Wattgate.. pick your favorite boutique brand... they all used stamped brass contacts, maybe gold, silver, rhodium, whatever plated, but stamped brass(99% of the time) to start with, and they have holes in the positive & negative contacts! What is that all about? I'm sure there is some reason that the plug contacts have holes in them - but I've never seen the purpose of the holes explained. And then the wire is attached to them with a screw..... and of course they are not sealed. The PS contacts are solid metal, not stamped, thicker than any others I've ever seen and therefore produce a very tight connection with your wall outlet.
I've also had some of my PS cords for going on 9 years now.. and I've never seen the contacts show any visible sign of tarnishing, corrosion or oxidation. This is a good enough reason for me to use them.
Pangea just came out with a new version of their AC-14 called the "XL" model that is using solid copper blades. This is the first brand of power cord I've seen other than PS Audio to use solid contacts. I would expect them to expand this construction to their other models shortly as well. Might be worth checking out - price is definitely "reasonable" compared to other boutique power cords.