Hi there, just purchased my first fretless bass, and not sure if it is this model, the strings or the setup made at Thomann (yes, I paid to have it setup before arrival) but the sound is great, playability is great but so far it is lacking the strong mwaaaah sound of fretless. Not sure why, still have to experiment. Using plain sound no pedals or anything. But another Stagg fretless I've tried in a store (plain wood no polymer coating finish over the wood like in this Sire) had the mwaaah sound right there without even an amplifier connected.
Sound of the 5-th B string is powerful! And great playability.
My $0.2 on this just arrived bass. Otherwise a very nice instrument.