I just got my copy of this book on Tuesday. At this point I just finished chapter two. From what I can tell so far, a lot of it is geared towards the planning aspect of making a game and approaching it in a manner that will allow for project completion.

Looking through the book, it doesn't really give a lot of scripting examples, so I doubt it will be for the mid ranged experience level (and above) 3dgs user. But like I said, I haven't read it all the way yet, so I could be wrong.