Great book, I enjoyed it via audiobook and it's a particularly good reading of it by one of my favourite narrators, John Lee if anyone likes audiobooks.
I think it confused some of his fans because it's moved away from the kind of literary fantasy he usually writes to a more science/speculative fiction if still rather surreal. It does the typical scifi novel thing of dropping you straight into the world with very little in the way of explanation and drip feeding you bits of information.
There are some great concepts and lines but I'll not post any since they were some of my favourite parts and wouldn't want to spoil them for anyone.
I'm always interested in where they place Fforde's books in book shops, they don't seem to be able to decide where he belongs.