I thought that I would add my two cents in. I have played around with the KCI gold cables for some time now. I may have been one of the first ten owners of a pair. I have brought them to a few audio RAVEs here in New Jersey with very good results. What I liked about the cables were the openness, naturalness and depth to the sound stage (layering and placement). The actual instruments sounded more real with the KCI ICs. Decay of the notes was very good as well as hearing the reverb in the recording (like a whisper fading out). The gold does smooth things out and can make other cables in comparison sound slightly edgy.
In comparison to other cables, I can see where someone may think that they sound a little on the thin side. Unfortunately, those other cables sounded flat where the sound stage was one dimensional, plus the overall refinement and the overall tone of the instruments was lost.
Overall I preferred the KCI cables in most of the systems I tired them in. Nothing is perfect but these cables do so much correct. They are also very flexible which for me is a welcomed change. Overall the build quality is very good and they looked more professional then a few other cables being sold by other small businesses. If you want a thicker sound, ask John to increase the wire size. Last, John a great guy and he backs up his products. Should you have any issues with his product, he will provide excellent and fast service.
Happy Listening.