I've had both the original KK Baby Bass, and the Ampeg that it was essentially a copy of. When I was new to playing DB these things were an absolute Godsend, plus Kris Kedzior is a lovely guy to do business with.
I used my Baby Basses at a raft of cool gigs (Proud Camden, The Water Rats, etc.) and they performed admirably, but eventually I reached the point where I just preferred the 'natural' sound of the DB. By that point, the practical advantages of the KK design (mag pickup, no feedback, easy to transport, built like a tank) were no longer so important to me.