I had one of the Hohner ones and loved it. Mine was a 5 string, and yes, there wasn't [i]quite[/i] enough oomph at the low end, but a very comfortable bass to play. It sounded awesome through my Trace stack at the time - that sounds really 80s doesn't it?
I would imagine another limitation being detuning strings as they're double ball end, but I've never tried this, so wouldn't really know.