For me if’s really hard to rate this thing. It surely didn’t age that well, but even if i consider it’s age it is lacking in a couple of areas. Things that are rather easy to understand are explained in detail again and again. On the other hand rather complex things are just mentioned without much depths. Sometimes you get the feeling the only reason why he added a third example for the easy to understand concepts is to show of his consulting clients to boost his ego. It really has tons of ideas that get you thinking. Sadly you need other resources to actually implement the interesting bits because with this book you just don’t have enough understanding of those ideas and their consequences.