That's a new one on me, not heard of one of those before... any comparison to any other instrument, playing and/or soundwise, Mark...?
Seriously, you've not heard of the 18v toilet seat?
The Musicman Bongo was a joint design with BMW. The looks aren't for everyone by a long shot, but the 18v electronics with 4 band EQ make it a sonic monster. The dual humbucker model that I have goes from smooth creamy funk to balls to the wall rock. And, despite the polarising looks, the Bongo is wonderfully ergonomic when you're wearing it - it feels better when I'm wearing it than any other bass I've played.
Soundwise, it's a different animal to a Stingray. It has that great Musicman active vibe to it, but has a much wider tonal range. I've played dual humbucker Bongos in a hard rock situation and made drummers and guitarists run crying to their mothers. And that's with flats.