I have been exclusively using Shunyata PC's for the past 6 or 7 years. I had started with the sidewinder, coperhead and moving up to the Tai Pan, then Python, and, recently, Anaconda. The sidewinders/copperheads were marginally better than my signal cables, with more secure connections, better shielding and build quality. The "marginal" diffference enticed me to move up the line; the Tai Pans were a revelation, exponentially better than the prior, the Pythons were more of an improvement than the TaiPans over the Copperheads and the Anaconda upgrade on my CDP (all into Hydra 8, by the way) has brought my digital playback to a new level. All the while, I always felt the dollars invested were well worth the performance upgrade. You do need a very revealing system to discern the differences in power cables. I would think that the sidewinders (pretty much the low end or the shunyata line) exist(ed) to offer the end user a taste into 3rd party power cables. You really can't expect jaw dropping imporvements (over a Rat Shack $10 cable) for $160 dollars. But, once you see the difference in build quality, secured connections and think that maybe that shielding is doing something (or NOT doing something) one may think that there may be something to PC upgrades, and, if funds permit (you wouldn't put a $2,000 power cord on a $300 CD player) go to the next lever, audition some more, and see if there is something out there that really improves ones systems. Shunyata has done that for me. I would never have thought that I would have $10,000+ in PC cords but once I installed that first $165 PC, it just did enough for me to experiment. Great products. Great Company.