Audio Note copper vs silver cables: opinions?

I'm looking for opinions on and impressions of Audio Note copper vs silver cables, the difference between their characteristics, and conclusions you may have come to on paying the premium for silver. Did you demo both and go one way or the other? I'm looking for input on both Audio Note interconnects and speaker cables. I have been able to demo the copper Lexus speaker cable and I'm impressed, but not being able to demo the silver cables I'm trying to capture the essence of the differences between them from other's comments. All input appreciated. Thanks!