I thought the world-building and musical element of this story was probably William's most able. He does a good job of paralleling faerie with the mundane world in ways that both delight and unsettle. 
 As usual, however, Williams tries to shoehorn in a romance for the sake of tradition or expectation, but gives it far too little screen time for it to be effective. (view spoiler)[ Poppaea gets far to little spotlight time, far too little evidence of character growth or interactions with Theo before she ostensibly falls in love with him. Also, I thought that the relationship between Theo and Core was a little bit of a violation of Checkhov's Gun - we wonder why so much effort went into hinting at a romance between those two, only to have it chucked aside for Poppy, leaving Core to pair up with Cumber because with Williams, as with William Shakespeare, everyone must pair up. (hide spoiler)] 
 An enjoyable read overall - the world of faerie and the city of new erewhon and the various corporate characters involved were far and away the most compelling part. Theo's relationship with his mother and girlfriend were also particularly well-conceived and not what I expected. 
 Another highlight of this novel is the fact that, while long, it is standalone. The story, blessedly, resolves at the end of the book. I understand that a running series takes less effort and makes more money than creating a new story every time, but my own personal selfish wish is that more fantasy authors would write shorter, tighter, standalone novels.