This is a great repertoire book. I was very glad to see the re-release and update, as I had lost my original copy (it's probably in a box somewhere). I'm a fan of repertoire books, but readily admit that many of them are rather disingenuous and lacking in substance. Summerscale's _A_Killer_Chess_Opening_Repertoire_, however, is quite exceptional.
The Colle-Zukertort has a lot of bite to it and the 150 Attack is one of the most flexible and viable approaches against the Pirc (James Vigus agrees--see his _The_Pirc_in_Black_and_White_). While the Barry is capable of putting the unsuspecting or unprepared KID player in quite a pickle, when posed against a well prepared black player expect a fairly sedate and equal game that emphasizes queenside maneuvering and central play. The latter is not necessarily a bad thing from a psychological standpoint, since many KID players are looking for a big fight and a vicious kingside attack. The best things about this book are its presentation of ideas through games and Summerscale's accessible coverage of themes. While theoretically responsible, this is not a theory tome.
Sverre Johnson's update is useful and insightful without being intrusive. He updates the book mostly by adding in some newer games and some more recent analysis. A key example of this is his addition the the Bg5 section against the Dutch. His analysis here is consonant with that which he provides in his own book's coverage (_Win_with_the_Stonewall_Dutch_) of anti-Dutch systems.
If you're a "C" to "A" player who's looking for a repertoire and who works 40+ hours a week, but still loves to play in tournaments, then this is the book for you.