I like Stephenson's writing, and the Mathic world he has built here, even if the space scenes are laborious. There's a bit too much happy serendipity in the plot and Erasmus is too shallow a character. (Though perhaps this is appropriate for a 19-year old man.)

The story, though, feels like a fable meant to educate the reader on two concepts. The many-worlds interpretation of quantum mechanics and Penrose-style quantum explanations of consciousness. The former is interesting and I applaud bringing it to a wide audience, but the latter is hocus-pocus claptrap. Weaving them together only serves to make both quantum mechanics and the philosophy or mind seem hopelessly mystical and fantastic.

Sigh.