I have seen that too. I dont know how good sounding they are but quite frankly, I dont know how they can meet the safety standards with thin polymer insulation. Using thin polymer to insulate interconnect is ok because of the very low voltage passing through but it is inherently danger to use that to insulate power cable. I know I was called a wimp by some audio friends of mine before but I am not going to compromise safety for sonic reason. There are other ways to get good sound.
Just my 2 cents.
Just my 2 cents.