Thanks for the prompt responses... In my older age (and now semi-retired) I have less discretionary income and any future changes to my system have to be really considered as to cost/benefit. Years ago, I would change equipment often chasing the "absolute-sound" and most of my changes did make enough of a difference (at least in my mind !) to warrant the cost, but some definitely didn't... I have found though that years ago, treating the room acoustics and balancing things from those perspectives can make a HUGE difference in listening enjoyment.
About 10 years ago, I had an audiophile friend being over a pair of power-cables that his friend made. They were I believe about 9-gauge copper however had some powerful neodymium magnets just before the two ends of the cable. Just powering up the amps, I noticed a slightly diminished noise-floor and listening to familiar music, that lowered noise-floor helped flesh out some micro-dynamics which made my listening more pleasurable. I believe those cost me about $250-each and in my opinion, were well worth the investment. The same cables on the preamp power-supplies made no appreciable difference, hence I didn't buy them.
Regarding the power-cable discussed in this thread, my hat is off to capitalism, and to innovativeness in stretching the imagination enough coupled with engineering prowess to make changes and improvements to the age-old simple power delivery cord ! I just wish they weren't so damn-expensive ! Remember... Everything you do from the wall-outlet to the transducer affects everything you hear to some degree... It's just that some things aren't audible...