At long last I got my hands on one of these at a reasonable price from overseas, weeks after its initial release, yet still some time before it graces retail shelves in the Western Hemisphere.  It does not stand up to the huge presence of the main Ninjago City before it, but I believe it packs an even greater density of detail, making it a very worthy standalone product.

Videos:

(25+ mins) LEGO Ninjago City Docks review! 70657 (4 mins) QUICK look: LEGO Ninjago City Docks 70657