Having read all 3 volumes of `Harrington on Hold-em' (must read material if you're serious about playing hold-em well) I thought I'd also give this book a go.
The book brushes on a number of concepts and theories that HOH and other books go into, (suited connectors, pot odds, etc) but in nowhere near as much depth. To be honest, having read the book there's wasn't really much else, if anything that I felt I'd learned. And although Daniel Negreanu is considered one of the best poker players around, and has far more experience of the game than I do, I would argue that some of his theories are somewhat strange, especially how he advises beginners to stick to fixed, very large raises when they pick up a hand (almost robotic like).
In summary, if you're very new to the game and want a crash course in some useful theories you can read in a day or two then go for this. If you have more patience and really want to scratch beneath the surface go for the HOH series (volume 2 if I had to pick one of the three).