Good story, followed through pretty well from STN:Continent, which I haven't read in quite some time, so I didn't really do much cross-referencing, so take that comment for what it's worth. My two major issues with the book were:
1) Apparent lack of proofing whatsoever. In some cases it appeared that the author had stopped typing mid-sentence and picked up some time later, forgetting what exactly they had said because they had previously stopped typing mid-sentence. (re-read for example) At one point a whole paragraph was in there twice in a row. This sort of thing frazzled me a bit as I was reading it, and took away from the immersion to an extent. Each chapter was written by a different author so this is not a consitant trend through the entire book. There is some good writing in there as well.
2) More story, less technical stuff. This seemed a bit more 'novel-y' than the previous books, I kind of didn't like that aspect of it. That was just me though. Some of it was pretty good though, and a fun read, like the chapter about Knoll Jr. as well as the Blacktower chapter. All-in-all, I'd have to say that I liked the first STN [:box] the best, but that's just me. The cohesiveness of the story between chapters seemed to be better in this one [Identity] than STN:Continent, though.
Overall I give it three stars because I am a grammar nazi but you might enjoy it more. I recommend it if you've read the previous ones.