Had it for 5 years, finally read it. Fascinating, wide-ranging, lots of illustrations - but not much new or surprising. The author's basic theses - that historical change is more intellectual than economic, political, etc etc, and that most of the ideas that shape our thinking are prehistoric in origin - would not get an argument from most historians. And Fernandez-Armesto's right-wing bias jumps off of every page and hits you in the face. Anything left of center is dismissed as "unrealistic" or "dangerous" or "vague and spineless." To be fair, he doesn't like fascism much, either.
Perhaps the most interesting thing about the book is the quirky choices of illustrations. For ideas he doesn't like, old Hollywood movies: Piaget's theories with Laurel and Hardy in dunce caps, for example; or for "existentialism," a shot from "Easy Rider." For ideas he DOES like, such as sharing of food, old photos from the Fifties (a suburban white family at Thanksgiving dinner), or Disney characters - for "ethics," Jiminy Cricket (!) saying "let your conscience be your guide." And sometimes the pics are simply inexplicable: why is there a bust of Benjamin Franklin on the page about chaos theory?
My recommendation - read it, but don't be taken in by his frequent claims that this idea is "outmoded" and that one is "generally accepted," when those judgments are really just his own.