As a relative beginner, I have two guitar chord books. The first I bought was "501 Guitar Chords", but I needed something more, and found this one browsing in a bookshop (then bought it here at a better price, of course). The two books complement each other and I wouldn't want to be without either.
Of the two, I think this one has more practical chords - what real guitar players actually use, with easier fingerings, even if they may not be purely constructed. The introductory section is helpful and includes use of a capo. It is spiral bound with solid hardback covers so overall really practical.
Whereas 501 is divided by key then by chort type, this one is all organised by chord type, of which the selection is wider than 501. It includes first and second inversions as well as augmented, diminished, suspended, 5th/power, major 6th, minor 6th, major 7th, 7th, minor 7th, minor/major 7th, diminished 7th, 9th, major 9th, minor 9th, add 9th, major 11th, minor 11th. The introductory words to each chord type are interesting, often with examples of where to hear the chords. There is a really useful section on moveable shapes. It is also the only chord book I have found that includes slash chords, and that was one main reason for purchasing it.
Overall, I am surprised this book is not more popular.