The book covers the following chords for each natural key:
minor 7th flat 5
dominant 7th supended 4th
dominant 7th flat five
dominant 9th suspended 4th
five (power chord)
Each chord is shown with between two and six variations. Sharp and flat keys can easily be played by sliding the shown forms up or down a fret.
The book gives three illustrations for each chord - a traditional chord chart, and photograph from the front and from the player's perspective.
The notes are not listed above the strings in the chord chart, which is a blessing and a curse. It would be nice to have, but by writing them in yourself you will teach yourself the fretboard and begin to see the patterns in the chord forms more quickly.
A few forms I would have expected to see are missing - for example, the full G shape chord is split into two parts, but they don't show the full six string version, but you can see that yourself from the forms they do show. And if you take the time to write out the notes and learn the patterns, you'll quickly be able to see where optional notes can be placed or notes dropped and why.
The common chord progressions it shows in the back of the book are great as well, and give you examples to put all the chords you've learned into practice in a variety of styles and strumming patterns. Drill them in every key.
The only thing keeping me from giving it a full five stars is the lack of any mention of slash chords and how to play them. If you take the time to write out the notes for the chords though, you can see what the bass notes are easily enough.
The bottom line is that if you learn all the chords and forms in this book, and practice the progressions, you'll be ready to play just about anything you come across.