I bought these to use with my bass guitar, a 4-string J&D P-bass that at the time was tuned in C standard.
For that tuning these strings were excellent!
The sound, feel and tension were perfect, and they keep their tone a lot longer than D'addardio.
Some time later I adjusted the bass for B-standard and unfortunately the lowest string couldn't quite keep up; it became to wobbly and muddy and forced be to raise the action a bit higher than I'd prefer.
Still, perfect for C standard and above!