I am fan of the technique that GTD is. In this book, the author introduces the technique very well. Only problem is that it is very difficult to set up it on your own. In my opinion, this book serves as an introduction and as an advertisement for getting coached by David Allen. I attempted to set up a digital GTD System by following this book and ended in doing lots of experiments. I am still not able to completely set up the system, but I am confident that I will. Read this book once to get overview, take notes, try to set up the system and then read it again. Probably you will set up the system after reading it the second time.