I have mixed emotions about this book--it has amazingly written passages, and some incredibly rich, detailed worldbuilding, and some of the coolest conceits around--but I found it structurally somewhat frustrating (a little too meandery and unfocused*, and a little too hard keeping the characters straight) and in the end, depressing as a fork in the eye.
Wow. This is one dark world, and that's me saying so. Nifty, though.
*As a reader, I am such a structure queen, I tell ya.