I give this book 4 stars with reservations. Many of the patterns are VERY similar to those in Advanced Origami. However, between the two books, I'd advocate buying this one, so, hence the four stars.
LaFosse's books are unique in that they focus on paper and on wet folding. He empahsizes the art of folding, not intricate folds. His patterns tend to have a fairly low number of steps, but in order to generate the desired final product, a lot of time will be spent finishing.
The repetition starts in the "Techniques" section at the front of the book when he talks about making paper. Identical photographs are used in multiple cases between this book and Advanced Origami.
Entirely new patterns not similar to those found in Advanced Origami include a lobster, a fairly weak monk seal design, a great manatee fold, a cormorant, a great penguin, a modular flower requiring several sheets of paper for an un-extraordinary result, a fairly mundane fighter jet, and an amazing alligator. It's basically worth buying the book just for the alligator. Folds that gave me deja vu included the grackle, whale, butterfly, turtle, and orchid. (Sound familiar?)
Anyway, it certainly seems worth having one of LaFosse's books in your library if you're an origami enthusiast. If I had to choose, I'd pick this one. If the first one totally rocked your world, then you'll want to pick this one as well.
These books are for an intermediate or better folder, in my opinion. Complete beginners will probably find them a bit frustrating.