I have tried one of them, not sure which one. I tried it active and passive and in various configurations. To me it's a bass that can follow one along many paths and can be used to very diverse sound necessitiets.
If I were not already convinced of having the bass of a lifetime, I think I would have bought one of these. I think it can be a definitive instrument, good enough for anything, not something you say often at that price.

-- Michele Costabile (http://proxybar.net)