I inserted my Neotech copper-graphene cables between my Black Ice hybrid preamp and my Goldmud monoblock amplifiers in my exercise room two channel system. The replaced a pair of QSA Landeri cables. I dont hear any major differences at this time. The overall tone colors, dimensionality and soundstage have not changed to any discernible degree. One caveat, though this is a very fine sounding system, it is not as resolving and transparent as my reference system.
I dont conclude that these cables are not fine performers cause I think that they are despite the fact that I have not had a " I am hearing things that I have never previously heard" moment just yet.