I picked up my K1600B on Saturday. It's a fantastic bike.
I have owned the K1600GTL, R1200RT, and numerous Harley Road Glides. When I read about the Bagger, it seemed that it was the bike for me. Owning and riding it has proved that to be true.
The ergonomics are excellent. Great position for the handlebars, the footboards offer the ability to change positions, it seems lighter than it actually is (I've used the reverse feature once; it seems easier to back up under foot power only), the seat height is perfect (I'm 5-11 and my feet are pretty much flat on the ground). The electronics are superb, although I didn't notice anything all that different from the GTL and RT that I owned before. Unfortunately, the BMW seat is not for me. It gets uncomfortable after about 1/2 hour. Changing position with the footboards helps a little. I will be ordering a Corbin saddle shortly.
The ride is extremely smooth, and the engine is powerful. Shifting is pretty much effortless (I haven't tried the shift assist pro yet).
It is a very handsome looking bike. The lines are sweeping and sleek. The black color and the blacked-out engine, wheels, etc., really set it apart.