I try not to get too caught up in the voodoo science, snake-oil and fairy dust of the "wire" biz.  However... I have tried a few of the “specialty" power cords.  And as bad as I wanted NOT to hear a difference, unfortunately I did.  And I perceived the differences to be an improvement.
Like another forum member reported above, I have settled down to PS Audio power cords.  They do bring out more low level “rez”, details and “dynamics” to my ears – more clear – more “there” there, blacker backgrounds, less hash, haze and noise.
I don’t go any further up the crazy chain than the Perfect Wave AC-5 (which I buy when I can find them used).  The AC-5 is about as big and bulky as I think is feasible to deal with, lest you risk damage to the IEC jacks of the equipment unless you support the power cord somehow – which I do anyway on some components, depending on how the cord lays.  Once you get to such massive power cords, they will lift/move smaller components.

I like the PS cords even if I didn’t think they sounded better, if for no other reason than the “connectors”.  Take a look at the prongs/contacts… these are not stamped brass, or gold plated stamped brass.. but milled from solid chunks of metal.  And then plated and polished to prevent oxidation and tarnishing.  And if you do a little research, you will discover that the wire is welded to the plugs internally, not attached with a screw or soldered – welded.  And then the whole thing is sealed in a molded plug.  I have searched and searched and searched – if you can find a power cord with a better made plug/connector on it – I’d like to know about it.  It doesn’t matter if you buy wattgate, marinco, Oyaide, blah, blah, blah…. Gold plated, platinum plated, rhodium plated, silver plated… they all have stamped brass contacts to start with, with holes in them and wire attached with screws…maybe soldered.  Now, having said and observed all this – Does it matter?  Can you hear a difference?  That is for each individual to decide for themselves.  Remember.. hearing is a perception and partially psychoacoustic, i.e. if you "think" you hear it - then you do - period - end of debate.

I plan to try one of Steve’s and one of Cullen Cables to see how they sound or “if” they sound.  I also have one of Wire World’s Electra 5’s, which I bought out of curiosity, since its wire and braid design is “different” than most others, just to see if it did in fact sound different.  I haven’t had time to actually A/B it to anything yet, as too many other things have been changing in my system recently.  I’ve got to get my system settled in and become familiar with the systems normal sound before I can get down and do any comparing of the minutiae of power cords.  This is my .02 cents on the power cord subject…

Anybody had the chance to listen to the Shunyata Power Chords?  Specifically the ones with the ΞTRON technology?  There's a video on youtube showing the technology and how it works compared to a square wave.  It's pretty interesting and even Paul McGowan (PS Audio) mentioned it on one of his musings, so it caught his attention as well.

While they are not inexpensive, IMO the entry level ΞTRON cables are reasonably priced in comparison to a lot of other manufacturers out there.  The entry level ΞTRON Viper runs about $595 for 1.8 meter and the next step up (sexier-garden-hose) ΞTRON Cobra runs $995 for the same length.  But at least there's some science and patented work behind it in comparison to a lot of snake oil and hype that a lot of the others use.

I would be interested in hearing them in comparison to other cables of popular choice such as PS Audio, Kimber, LossLess, Nordost, etc.

Hi mad dog, thanks for the feedback and interesting points to ponder and also bringing my attention to some other manufacturers who have already worked on similar designs.

But I'm not sure how you would believe that the cable is flawed though?  As all I'm seeing is their use of micro-circuits that are capable of isolating magnetic and electric waves thus running them independently through the wire.  So it's not actually the wire itself measuring perfect (or close to perfect) the micro-circuits are the ones having the effect on the wire.

So a cleaner signal in can't be bad, however does it make it sound better?  I have to agree with you that better measurements don't neccessarily = better sound.  We can take that from Paul McGowan as well when he was touting his latest amp and when he brought it to an amp shootout it got it's but kicked by a 10 year old tube amp

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I see, so why on Earth would Shunyata be doing this if the problem is already solved and has been solved for a long time?  Maybe, they are hoping nobody notices

Even McGowan (a long time cable manufacturer himself) mentioned them in his recent blogs, you would think he would know that this was solved also.  Doesn't make sense, something to ponder though.

surely you know the answer to your own question.....
there is no other area of "the hi-end" where marketing hype is so prevalent and the profit margins so high.  One could go so far as to say a lot of it is down-right predatory in nature.  I suspect fraud could be proven in many cases.  Nowhere else in all of our hobby does "caveat emptor" apply more.  The next most rampant fraudulent area is in the marketing of vacuum tubes being NOS tubes... of which, many actually aren't.  And even if they are, they are not necessarily “better” as the marketing types have somehow managed to instill as “a given”.  And managed to get some people to pay absurd prices for them – rare they may be – better is not only debatable but in many cases can be proven to be an untruth.
I have seen and heard Shunyata products in demo’s, displays, etc. but I have never actually owned any or had them installed in my system as there are no dealers in my area.  So it would be impossible for me to make any kind of judgment, subjective or objective.  But I am skeptical that any difference would be an improvement over tried and true cables that are designed upon long-standing and well-known laws of physics and electrical signal transmission theory - and I’ll leave it at that.  And I’m not about to purchase something this expensive sight unseen and  unheard, that has, at best, a completely “subjective” effect and is surely system dependent as well.  So all I can say is, if they make a difference in your system, that you perceive to be an improvement, and the improvement is worth the cost to you, then it “is”.  So please report back to us your impressions when you hear some Shunyata Etron cables in your system – I am anxious to hear the impressions people have of this new technology involving the passing of audible frequencies thru wire.

I'm quite pleased with the "middle of the pack" PSA power cords as well.  But I am certainly not against at least listening to something new and/or different.  There is an "objectivist" side of me, that only allows me to wonder so far down the "wire" path of lunacy.  If the manufacturer can present a reasonable explanation of why their product is superior and that explanation is actually applicable to the transmission of audible frequencies thru a given length of wire, then I'm "all ears" so-to-speak.  But when a company starts inventing complex gizmo's to fix problems that don't exist or have already been solved, just to demonstrate, "hey look what this does to the signal", without a clear explanation as to why their new solution to a non-existent problem is even applicable to the sound coming out of a speaker... then it’s time to step back and ask oneself, just WTF are they trying to pull here?
Please don't misunderstand, I am NOT bashing Shunyata or any other company in the hi-end wire biz, I'm just saying, when a piece of wire is marketed at the price point of a very good main component, we need to approach with extreme skepticism and caution.