I've bitten the bullet and put a set of Rotosound Jazz 77 flatwounds (45-105) on my Warwick. Recently I've been wanting a more vintage, thumpy sound as opposed to a hifi sound, and as I've got an approximate EQ I thought I'd back it up with a nice set of flats!
Initial impressions - they feel a lot different, even to the TI flats I have on my fretless, they're quite grippy actually which is a good thing. The tension is also noticeably higher than the rounds I used before, the D'Addario Prosteels. I find that playing nearer the neck helps even out the response that I was used to.
Haven't tried it through an amp yet, but through my Pandora PX4B it sounds great - no sharp high end, even when the treble is rolled up full, and a nice even response across the strings.
Happy customer here so far