[quote name='fretmeister' timestamp='1443977715' post='2879149']
Surely there is something negative about them?
[/quote]No*.
I can understand the potential grief from your significant other, it's what I was expecting from mine. However, I played her the YouTube clip of Peter Kastner playing Nardis and because it sounds so different, she could tell it wasn't just another bass and could see/hear why I wanted one. What will also not help your desire to avoid getting one is that, with just a little judicious EQing, you can make them sound like a conventional fretless. Sorry.
*They are expensive, but comparatively cheaper secondhand than a similar level quality DB.