Well... I happen to own one white bass.
It's a Malinek fretless 5, made by a relatively little known Poilish luthier Ernest Malinowski (he's dropped the Malinek moniker, now he calls his guitars Malwood). Heavy - VERY heavy - ash body, maple/wenge neck, lined fretless rosewood fingerboard. Unfortunately, the EMG DC pickup messes everything up (too much lows, ugly, "detached" highs, not enough singing mids... usual EMG story). I used to love this bass (especially considering the fact that I bought it for peanuts), I recorded several songs on 5 albums with it... I'd probably change the pickup to a Bartollini for example but 1. I cannot be arsed, 2. it's too big (the headstock!) and heavy for me and I'm seriously - and I mean SERIOUSLY - GASsing for a headless fretless 5... which I can't afford atm. So, for now, the Malinek stays. It's a good bass - but not exactly what I need anymore.