Just finished this, but to be honest was minded to stop with about 50 pages to go.
The book starts as a detective story, set on Earth in the nearish future. There are no spaceships, Space Marines, interstellar travel, different worlds or alien races (except some of these are hinted at). The Earth and society itself is fairly recognisable, with mention of wars and invasions and terrorism, but no real changes to day to day life. Apart from the neural mods (apps for the mind) which are very very similar to those in Infoquake (David Louis Edelman).
The future-set detective story is OK I guess, but I a not a fan of detective stories. Then in the second half the story shifts to being a hard-SF quantum physics thriller, which required too much brain power and concentration for me to enjoy, and once you take on-board the mind-blowing idea(s) the plot is quite simple and overall I didn't find the second half that interesting or enjoyable.
The writing itself is fine, and I can appreciate the idea of starting as a detective story then leaping to something else, but to me it didn't work. But that may be wholly because I like space opera (Reynolds, Banks, Hamilton) SF rather than gritty less-fantastic SF.