I started reading this years ago and got about 250 pages in before I put it down for some reason. I recently dusted it off my bookshelf and brought it with me to London. I've not regretted it one bit. I'm not sure if being new to the city and Mieville being a Londoner has anything to do with it, but I can almost feel the inspiration behind it as I'm walking around.
Fantastically imaginative. Can't wait to finish it and give a full review.