I used to use them - they had a good sound out of the box but went dead quite fast and felt coarse (not as bad as Rotosound .66s, though). Also, I did get the occasional dead string in a set, or the occasional string with odd overtones, which is the main reason why I stopped using them. They were quite like DR highbeams in sound and feel, come to think of it, but I far preferred the DRs.