I used this book for three years while living in India. While its illustrations are not as robust or detailed as those of western field guides, they are usually adequate. First, and foremost, though, is that this volume is currently the ONLY book that contains all the species. Others contain a mere fraction. For that reason alone, this is the one book you should get for IDing birds in India. The rest lead only to disappointment, unless used in conjunction with this one.
This book is the illustration subset of the much larger Handbook, which comes in a 10-volume set (or in one tiny-print "compact" volume). The two work well together: one for your field forays, and one for the bookshelf back home. Be warned, though: the compact Handbook, while an exhaustive study of each species (including migration maps and exhumed stomach contents, etc.) is expensive when you can find it.