Bought these because of the Brian May endorsement, but I must say that I am somewhat disappointed. The sound is different from regular strings to be sure, and I liked the sound of these when they were new.
But they wore out very quickly, already after some weeks the gold had worn off in places where I play alot, exposing the nickel (?) base. At about the same rate the sound got duller and duller, faster than a nickel string wears I would say, so after a month it was definitely time to change them. Most unpleasantly my fingers started smelling of metal quite strongly after playing the worn out strings, something which I haven't experienced with other strings.
I will not go for these again.