There are some comparison tests around. High end cables make a difference when recording. From my recording experience, I have never seen high end expensive cables.
If you are considering this for live application, I think they are a waste of money. Every room or every stage I have play affects the sound. I have never been convinced that high end cables will compensate for that.
Will high end cables make my sound so much better that I'll get more gigs? To me, the important criteria for cable selection is robust construction, durability and dependability.
Grumpy old farts #83