I received these strings roughly a week and a half ago and promptly put them on my favorite acoustic. The first couple of days playing with these, they were beautiful, easily the best strings I'd ever tried. Unfortunately, that didn't last. After about four days, the strings started sounding a little dull. Now a week after that, they look and sound very dull. I was very disappointed that they didn't last very long at all, because they really did sound great at first. Would not purchase these again.