This is truly an amazing book. The numerous colour photos are inspirational, and the text is very well written. This is one of the few sports books I've ever read that will genuinly make you better just by reading it.
Negatives? I'm not sure I agree with all his boot fitting advice, but he's totally right on canting: until you've experimented with your canting angles your skis aren't set up right. Second, some people will feel initially (as I did) that this book is overly focussed on carving, and as well from a racing and on-piste perspective. But I've learnt (and you should too) that you need to put at least a little carve into every turn, and until then you're not skiing pistes, moguls or off-piste properly. (OK, if you always ski on powder you don't need to learn carving). As he points out, carving is the diffence between playing soccer on wet grass in running shoes or football boots.
In summary: buy this book. You'll learn a huge amount about skiing and you can show your non-skiing friends the lovely photos.