i don't have a musicman, but flats onna fretless is always a good idea, IMO...gives it more mwaaaah...easier onna fingerboard, too.
and the feel.....mmmmmmmmmmmm...like warm apple pie...
i've tried fretlesses at GC that had rounds....hated them. didn't have the right feel or sound, but that's me.
IMO, you do get more warmth, or roundness, with flats, but, of course, YMMV.
you do what's good for you, and you will always be cool, unless it involves heat.
