CGP Book - what do people think of this?

CGP have produced a book for the OCR 'B' Geography specification. As always with CGP, the book is quite cheap. Does anyone have a copy and would like to comment on whether its worth getting as an extra resource / revision support.
I had a browse in Waterstones and it looks quite interesting, and I recognised some of the names of people who helped put it together.

I'm interested in how closely it matches the specification, and whether it's been written explicitly for the specification or adapted from previous books...