I really enjoyed this book (which, I admit, I only picked up because one of Stross's other books, "Rule 34" is in the same universe and I like reading things more or less in order). The far-in-the-future world he imagines is incredibly well realized and does, I think, an amazing job of taking people into account. His scifi was very fun, his characters were great and his story was fast-paced and exciting.
On a slightly different level, there were two things that stood out, to me, as being very well done. The first was that Stross did a very good job of imagining a world where what you look like influences, but does not dictate who you are. Characters are not defined by their masculinity or femininity and Stross really doesn't give in to the temptation to change charactorial voice when sex changes - a choice which makes for a better story.
And, on that note, Stross also manages to fit a razor-sharp and terrifying critique of 20th and 21st century attitudes into the middle of a sic-fi thriller without making it heavy handed. I am definitely impressed with that.
Given that the last two books I read that were set in a future left me very disappointed, this was definitely the kind of book I needed to enjoy science fiction again.