I expected to like this more than I did. Maybe it's that I'm not familiar enough with quantum theory to really appreciate aspects of it. I felt somewhat the same way regarding Catherine Asaro's "The Quantum Rose" - the plot is supposed to illustrate the behavior of quantum particles, but to me it just seemed like a fantasy novel.
Still, I don't think my issues with the book really had to do with the math. I found the continual present tense it's written in distancing.
It's also an introduction to a very complex world, with tons of interesting and very alien tech, different cultures, even different levels of reality. It has a lot of characters. Introducing all of these smoothly; letting a reader slide into the world without didactic explanations, while still letting the reader know the essentials, is a difficult task - and one that I didn't feel was always successfully executed. I like the lack of overt explanation, but there were moments where I was confused, or just couldn't fully picture what was going on due to lack of information. This also applies to the main character, a man who can't remember significant portions of his memory and past. It can be hard to get to know a character who doesn't even know himself. More in-depth characterization in general would have been good, especially considering that so much of the plot has to do with questions of identity (who are "you" if who you are can be downloaded, edited, transferred...?)
These things aside, this is still quite a good book, especially for a debut novel. Once I started to get to know the world and its functioning, it got pretty interesting. I assume a sequel is on the way...