I finished it the other day - and overall I thought it was awesome.
UnLondon is such a strange place that, at first, it takes a little getting used to. We journey through it with a Londoner, which is brilliant, because we discover the oddities and wonders as she does. As the story progresses, the world grows on you, you get used to it, and I found myself eagerly anticipating what I would see next.
I particularly liked Brokkenbroll, the boss of broken umbrellas - I could just picture Mr. Depp playing him in a movie