Just catching up on this thread, reading some newer posts. My goodness, I can read the public posts that were removed by the moderators. Yikes, one guy really lost his cool over this topic. The mods took care of that.
First "deluxe"
power cord I ever saw I guess was when I first wandered into
ACOUSTIC IMAGE in the early 1990s. My old gear had attached power cords, nothing to do about that (McIntosh MC30s MX-110, etc.) but the new stuff had a spot where you could attach a cord. The store gave me a few to try and I did, never compared, I just like the way they looked over my wimp cords. What I didn't like about some of them is that they were impossible to bend or work into a position where they would be out of the way instead of just dominating.
Starting in the late 1980s, I was floating (AC pun) in upscale power cords thanks to kind people, so I've never been without.
I use the basic cords (furnished with most new gear) for situations that I can't use a heavier cord but other than that, I use good cords. Actually thinking about it, the power cord brand I mentioned at the beginning of this thread is one that my buddy
@warren Jarrett can't
stand, and I trust his ears but I still use the cords in most places. They sound fine to me but then I've never really gone crazy with power cords like most audiophiles do. That's because I get them from the makers for demo'ing and therefore have no monetary attachment to any one brand.
Every audio show I've ever been to and every audiophile house I've been to uses upgraded power cords. Also, people I know and trust in the industry (Peter Qvortrup of Audio Note UK, Kevin Hayes of VAC and many others) feel good power cords are
essential in getting the most out of their gear, and most say so right in the
instruction manuals. They assume you will switch out the cords immediately, just like you would switch out those cheap Asian
batteries that they include with their remote controls.