I like my Zu Xaus a lot. I would definitely call it a very neutral cable.
I would not use it on bright sounding gear. I have a Mcintosh
pre and a Accuphase class A amp and it sounds great.
Recently I have started using my tone controls on my Mcintosh with great results, especially on new vinyl reissues. Some are far too tipped up,
i.e. Bob Dylan's "Blonde on Blonde", others are way too bass heavy, i.e.
Robert Plant and Allison Krauss' "Raising Sand". Right now I'm listening to a Madeleine Peyroux cd with the bass turned down considerably. To my ears it has a way superior sound, so much so that I will never go back to gear without tone controls. Fortunately this some of the most musical gear that I have heard, Mcintosh, Accuphase and Luxman.