As an information designer and interaction designer, I was disappointed in the book. It was clearly written for graphic designers by a graphic designer, treats information design as a flavor (or at most, an extension) of graphic design, and consists largely of the standard portfolio-show-off fare that you'll find in so many graphic design books.
It is very, very basic. The page-to-insight ratio is quite low. Normally, I'm underlining and circling things all the time in books as I read them; I doubt that I circled more than half a dozen things in the entire 230+ pages. One of those half-dozen was an excellent analogy likening good information design to an uneventful flight.
The material about user-centered design is not inaccurate, but it is dismaying to realize that the book's target audience is visual designers who have apparently never considered that satisfying the needs of end users might be more important than indulging their own egos. Any practicing information designer who has to be told such basics as though they were insights is in big trouble.
You'll get a lot more out of the books of Edward Tufte, Stephen Few, and Richard Saul Wurman.