Classic Bhante G stuff! It is extremely clear, and while it does place a bit more emphasis on morality compared to `Mindfulness in Plain English` (MIPA). If you are engaged in practicing seated meditations based on the MIPA book and have uncertainties, this book comes highly recommended. As has been stated, if simply observing your breath is all you do in the name of meditation, you won't gain a great deal. You require wisdom and understanding, which this book expounds upon at length.
Questions that might crop up are addressed in subsequent pages, sometimes a bit indirectly. For some reason, I felt it was a bit on the long side for approximately 250 pages. Just like `Mindfulness in Plain English`, I intend to re-read it again at some point!