I currently have Status halfwounds on my FBB fretless 4, and I love the feel under my fingers and the ever-deader tone they're producing. I think I want to go all the way to flats, though. I'm strongly considering putting a set of Lakland Joe Osborn flats on my FBB fretted 5 to replace what are turning out to be disappointingly dead Fodera Diamonds (the low B is much worse than I remembered), so I can still slap on the bass but get less fret noise and more focused lows and low midrange. It seems kinda anathema to put flats on anything but a Fender-style bass, though, so I'm still undecided. Anyone have any experience with flats on their high-end bass?