I've had them on one of my basses for the past 2 years. They had a bright "shiny" sound to start with, but they've mellowed out over the past year or so, to the point that they're now almost tolerable when played arco.
Many people have commented on how easy they are to play, when they've tried my bass.
I got 'em 'cuz I thort they might make I sound jus' like Ron Carter - I'm still working on that bit
- Wil