I agree with the previous review, this book doesn't allow you to calculate exact GL values, but what this book does point out is that foods very rarely have a precise GL value, but usually fall within a range.
For those people who don't need to stringently keep their combined daily GL total below a certain level, I think this book is great. It helps you make informed choices between a host of alternatives. I even get to eat peanut M&Ms (in moderation of course)!!
It's very small (about 4"x3") but has an extensive 56 page introduction explaining the whole GL thing, followed by 170 pages of food values grouped within sections.
I think it's great (and I've lost 10lbs in 3 weeks) without going short of food.
One last thing...
Following a low GL food regime means I don't get ravenous, but my mouth does still get bored (I love eating). Chewing gum doesn't do it for me, but I've discovered that TicTacs are just the ticket. They scarcely impact on blood sugar levels and keep my mouth busy when I might otherwise be tempted to nibble on something just to alleviate the boredom. OK, so you don't want to eat them by the kilo, but they're worth trying in moderation. Certainly does it for me!! Buy them cheapest as multi-packs from your supermarket.