Does anyone know anything about the new Sigma X line of Shunyata power cables? I was impressed recently by trying an Alpha X-NR PC on my DAC (despite a negative expectation bias), but hearing is believing. I'm therefore contemplating trying their newly released Sigma-X line of PCs but know absolutely zero about the expected sonic differences between their NR and QC models (the QC are ~60% more expensive!). Of course I can read the website information which will tell you at great length about the merits of each of their numerous bells and whistles technologies (without saying too much mechanistically about how they accomplish what they do. I guess I can always read the patents!) . But still, I'd like to get some hands-on feedback from anyone who has actually tried either of these variants with high powered (monobloc) amps. I anticipate that there is not much field experience yet with these, but if there is, please share anything that you think is relevant (comparators always welcome!)