My conclusions mirror audphile 1’s. And especially about the entire Alpha line. I had - all the way back to the Zi-Tron line, found the Alpha cables to be....bland. (This is going back to 2011). I find the ZiTron Alpha HC, as well as the Sigma line, to seem to have a very mild suckout in the lower midrange. Gabriel Caelin, the designer, disagrees with me, but no Alpha cable, no matter its provenance, has sounded less than "lean" to my ears. I wonder why they don’t hear it. Just listening to Frank Sinatra’s voice will tell someone what’s missing in the Alpha line, although it requires careful listening.
So, I finally went with a Sigma V2. I had a Sigma NR V1 back in 2016. I eventually sold it (I must’ve been high or something!), but after noodling around with Anaconda ZiTron cables, Python ZiTron and the like over the past 4 years, I decided to buy the Sigma again. And I’m extremely happy with it. It has great bass; not just bass weight, but bass dynamics. Many cables give defintion, or weight, OR dynamics, but frequently, not all three. The Sigma delivers all three, so you don’t feel as if your music is like an upside pyramid, with most of the "weight" of a performance very apparent in the midrange and highs, but the upper-, mid-, and low-bass are all anemic, which is what causes people to think the presentation is "thin" or "lean." If you have a solid midbass, that is what causes images to seem to be solidly "there-in-the-room" and not just ghostly imaging (the Series 1 WATTS, despite their lack of a lower midrange, had the most physical imaging I’ve ever heard. I can only imagine what it would’ve sounded like, back in 1986, with a Sigma power cord, although Shunyata did not exist until 15 years later.
Shunyata makes great power cords, no matter WHAT the naysayers say (and I'll match my ears with theirs ANY day!). I’ve had Transparent’s top of the line (the Reference and then the MM2), Nordost’s Valhalla cables (and Tyr 2) and Shunyata. The only ones I have now are the Shunyata.