There are few instruments with less cred than the fretless bass (the Howard Jones style keytar is probably the only one with less credibility) but I love the sound I get from my fretless Fender Jazz. I have tried others, inc a rather snazzy looking black Rick 4001 fretless, but the Fender is the one I always come back to. Has the rich lo-end boom I love and is versatile enough to transmit melodic detail that cuts through. If you want some 60s / 70s punch with a touch of that double bass "vocal" quality then there's none better that I have played. Especially if you use an amp designed for an upright. Warm n woody. Also comes equipped with "idiot lines" which after 28 years of playing fretless as my main instrument I still can't quite manage without!