I have used both silver and copper cables from Kondo, in my opinion they make great cables. Have used them with Kondo amps and other, always with very good results. IMO!
On another note: I have come to realize that very expensive cables are not neccesary to achieve great sound. I now use a mixture of Mogami XLR and Belden cables and I am very happy and will not buy another expensive « high end» cable again. But that`s me .