A certain online retailer asked me for a review of Pangea power cords..

I'm happier to read about a female's nice audio system.  I'm not sure about the P C.  if I knew who builds the guts of the  PC
Cardas  Wire ? 

Power cords apparently 'condition' the AC in some way.  That is how six feet of cord changes what we hear. Or, the last six feet of cord destroys the AC entering into our equipment. Probably the best way is to have the solid core in the wall extend out into individual dedicated cords, and by pass the wall outlet all together. Not practical. Solid core copper is excellent... what happens after leaving the outlet changes what is entering your equipment.  And, one good cord for your system will exaggerate in another system... PS Audio and Pangea cords have the same designer. There are others too. 

An interesting comment about destroying (ruining..) the last few feet.I own a lot of Pangea, but do still use a few ordinary home made sets of power cords.
In my acquisition and installation of a pile of Furutech duplex, and a few Furutech plugs, I then realized the previous brass (Wattgate) plugs used on some powercords, if reinstalled, sounded terrible. The brass gave a sort of background velvet buzz in the upper midrange. Easy to spot once I noticed . With brass plugs, buzz, no brass plugs, no velvety buzz. (this with no brass in the duplex. Furutech is pure copper,the ones I bought plated with gold or rhodium, with springs for grip)
Another thing which reaffirms the idea of ’damaging the last few feet:
I use a pair of 32 ft long, and 41 ft long (I extended the prior 37ft) the 41 to a ’on floor’ twin duplex box for the amp, the 32 ft to another on floor twin duplex box for the two conditioners. The wire in those extension cords is a dual Quad of MilSpec 12 gauge silver plated Teflon 600v wire. As used for extension cords, they really do not affect the sound. (Though many say silver plated copper tends to a bright sound) BUT, big BUT, if (As I did try) to make cords TO THE EQUIPMENT of the same wire, using rhodium Furutech plugs. The wire DOES SOUND BRIGHT. I really just had to swap the plugs to some OFC wire I had designed for AC powercords and then the sound is great. (same Furutech plugs on OFC pure copper)
Wat this EXPERIMENT showed me is that the only part that really matters is the LAST FEW FEET.*(* aside from the usual need for large enough gauge wires prior, to allow current to pass easily)

sleepwalker65Could one of the folks who endorse upgraded power cords please explain: how a 6ft “upgraded power cord” could best a run of the mill 14AWG or 12AWG power cord, when there is several dozen feet of pedestrian Romex wires through upstream 59 cent receptacles is in the path to the breaker panel?

You're assuming facts not in evidence. I use 20A dedicated lines comprised of 10AWG NM wire. There's not a 59-cent receptacle anywhere in sight.

Can anyone explain to me how the last few feet of a power cord makes a difference when the rest of the house wiring is standard Romex copper wiring ?