Bought these a few months go and have been more than pleased. The ball ends on the bridge side of the strings make changing them just that much faster, same as on my electric. Sound wise they are just right for my taste, with a punchy and warm tone, with good sustain. I did not know what the black strings would look like, but I adore them now! The only real issue I've had was that the high E string snapped, but this was due to me winding it the wrong way more than anything else, and it happened in my regular time for switching the strings out anyway. All in all, I would reccomend these any day and night, just lovely stuff!