Sounds like a BIG system. It would definitely be overkill for the bar gigs and small outdoor shows I do. The claim is that Jorg's 1210 is equal in volume to most peoples 4x10 cabinets, and the 1212 is supposed to be a little louder than the 1210. I have heard that people are replacing 6x10 cabs or 1x15/4x10 stacks with Jorg's 4x10 cabinet. That combo is going to be loud if you feed it the right power.
There's a guy running a 1212 with a 1210, and I think that might be a more reasonable sized stack, but you know how much air you need to push. Check out the TalkBass thread (or at least the end of it if you don't have a spare week).
Also, I think all of Jorg's cabs are pretty full-range, so I don't know how much bi-amping would buy you.
-Bob