I've just moved to D'addario EXL160BT (the 120-50 set) to tune down to C natural on my fretless, and I have to say I'm very impressed! Perfect feel and volume from every string, easy to play too. I didn't have to change the intonation at all, they were fine luckily. Not bad considering I had Labella Low Tension Flexible Flats tuned to EADG on before them! I only had to give the truss rod a quarter turn tighten and lower the saddles to 2.5mm at the 17th note (no frets!).
They are holding tune very well.
Very pleased, nice price too!