My experience with various power cords is somewhat limited because so little is stocked here in NZ, but I have played around extensively with what I could get my hands on. Here are some random responses to the previous posts. Saying it is better than Harmonic Technology is to damn the Sidewinder with faint praise indeed. The HT was one of the biggest disappointments I have encountered. With respect to the comments on whether to try on CD or Amp... From my experience, the best cables on CD transports are rarely the best on amps and vice versa. In fact the characteristics can get reversed - ie. relatively dull on the amp but lively on the CD transport, or vice versa. I find most good DACs tend to like cords that work on amps more than they like cords that work on CD transports, so this perhaps means those with one-box players may struggle to find a good cord. I would also add that you really have to have competent AC cords on every component before you can evaluate an AC power cable. 250 hours burn in should be enough, but 24 hours is not. I would give it two weeks if you can Carl. The best cords I have, sounded much as you describe the Sidewinder for the first week.
MY Sidewinder AC cord progress:
This is a demo from the Cable Company. They burned it in for 250 hours, and sent it to me. I plugged my Krell amp into it, and directly into the wall outlet. After a 24 hour settling time, I listened. Very bright, dynamically laid back, zero bass in the bottom two octaves, wide and shallow soundstage (that's a function of the brightness, IMHO). So far, not the best AC cord I've tried with my amp. MORE LATER....