I thought I'd take a chance on these strings. While the A, G, and C are sort of ok - maybe a 3 out of 5 - the kevlar D was a giant mistake. On my viola it's muddy, choked, and doesn't respond well under my bow. The sonic quality differences are obvious even to the untrained (but still musical) ear of my partner. They are also taking much longer to settle in than any set I've used in the last decade. I honestly wish I could go back in time and not buy this product. I'll be forking over the extra for Obligatos, Evah Pirazzi, or any of the Vision strings next time.