These strings are incredible. I have been using them for about 16 months. I would not use any other. They bring power, depth and nuance to the instrument. I can still remember when my instructor played his instrument for me for the first time with these strings on them. The sound he could bring out of the instrument was an order of magnitude greater in intensity and quality. My instrument while not as good as his, nor as ably played, got the same upgrade. I highly recommend them!