I just found myself falling out with my flats. For some reason, this bass just sounds lacking with them on. Tone down, too muddy. Tone up, too 'boxy' sounding. Playing with a pick exclusively.
I've used the same flats variant for a good few years...maybe it's just my tastes changing about what I want. I'm quite a busy player, and need more clarity in tone. Having used the D'addarios for years before the flats, I need to try new territory....and from what I've read, the Fenders are a little less harsh, with a rounder bottom end than the D'addarios.