i used to love them on a jazz, used them for years. just bought them again recently and they don't do it for me. reasons:
1. they have great midrange but lack on the low end, i usually had the neck pickup a lot closer to the E string side to get more low end but it wasn't ever enough. recording wise they usually got lost in the mix due to lack of low end.
2. they are a round wound sounding flat wound. i mean they have punch, midrange, treble, and sustain, whereas most flats have little sustain and have more bass/mids with no treble. not a problem just they are the most non-flat sounding flat.
3. the low tension and round core made it hard to do fast 16th, 32nd or 64th note runs because they have so much movement, i'm a low tension guy (had tendonitis, play with a light touch) but they were always buzzing out or i felt very restrained.
they are a very well made string and the sound is great if you like it. i just need more low end and less sustain. GHS or labella flats for me.