This book is an excellent introduction to contemporary photographic themes and practitioners, it's well-written, up-to-date and great value for money.
Unfortunately, because so much ground is covered in such a small space, it's hard to get a true appreciation of some photographers' work when it is summarised down to one or two sentences. Similarly, virtually all photographers are represented by a single image which, due to the format of the book, is often too small for practical purposes. Many of the phographers work demands to be seen as a series if it is to be understood.
These failings are unfortunate but, given the size and price of the book, inevitable. After reading this you will certainly find yourself seeking out more detailed information on many of the artists featured, but you will at least have a clear overall picture of the contemporary art-photographic scene.