You can read my review of the Tommy Emanuel bracelet for a few more details about the quality. This is my second one and of equal quality. The notable difference is these strings are stiffer than the Tommy bracelet because it has one solid string and two wound bass strings and the Tommy bracelet is all bass wound strings. Also the initials of each artist is etched on the catch (NW and TE).
Most of the time I wear the Nancy bracelet with the Tommy bracelet. Since the catches are magnetic they stick lightly together which is nice.
Beyond the cool factor of wearing something used by these famous people is to be able to support Wear Your Music.