Are manufacturer AC cables good enough?

I wonder how many of the nay sayers who claim power cables do not make a difference have even tried upgraded PC's?  To me, they either have not tried or can not hear.  And it is usually them who cite science to explain away any possible benefit.  I certainly did not want to hear the difference I did, it would have saved me money.  I did try and I did hear...and not subtly.  I have dedicated 20 amp lines, and upgraded outlets.  I still heard better music with better cables.  Maybe audio manufacturers should take the approach of auto companies.  They could sell a DX model, a GX, and a GXL.  The base model would have cheap cords, cheap feet, less expensive connectors and a dull faceplate.  The GXL would come with vibration absorbing feet, better connectors, a nicer faceplate and a metal vs plastic remote.  Then everyone could be happy!  Certainly folks who drive eco model cars think they are just as good as the nicer version, and don't appreciate the grippy tires, added horsepower, bigger brakes and navigation!

bikerbw:
" would you chance a lot of returns or bad reviews because you cheaped out on the cord." 

I think most notable reviewers use their own upgraded interconnects, speaker cables and power cables in their reviews.

Thanks I watched Mr Winer's You Tube video.  Smart guy.
I had a friend over who believed all in science, being that upgraded interconnects do not matter.  He wanted to try his DAC in my system, so we inserted it with his balanced interconnects.  It sounded poorly compared to my DAC (to the two of us).  Then I re-connected his DAC with my Audience AU 24 SX cables.  Wow.  It sounded better (to our ears). Easily.  We switched back and forth.  He was dumfounded that the interconnects made such a difference, as 'science does not support it".
So, if it sounds better (in all the subjective ways) go for it and enjoy!  If you do not believe, that is your opinion, or your science!  Isn't subjective pleasure the basis of our hobby?  

jbmays:  Hearing is my reasoning!  That is the only reason I upgraded my power cables.  Do you get that?  You don't have to understand it to appreciate it.  That is what everyone is saying.  If you don't get it (hear it) then you don't need it.