Books The Official Guide for GMAT Review, 11th Edition
Books and Publications Average Rating:

Rating: - Lousy Quantitative Section/No Tips or Strategies
This book stinks. It has a VERY limited review of the concepts covered in the math section of the GMAT and absolutely no strategies on how to get a high score on the test.

If you're rusty in high school level math, you're going need a serious review, which this book does not provide.

This book is mearly a catelog of old GMAT questions for the user to practice with.

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Rating: - Best of the GMAT review options
I went through this book, the Kaplan book, and the Princeton Review. This is by far the best of the 3. It has the most review questions and doesn't try to teach you any garbage strategies, just how to do the questions. The one shortfall is that the answer explanations are sometimes not in depth enough.

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Rating: - Good for biginners
I just want to give some advice before you buy the book.
First, The problems are way too easy compared to Kaplan. I bought Kaplan Before buying this review, and the problems overall are way harder in Kaplan.

Second, If you don't know what the GMAT is all about, I highly recommend the Official Guide. After you finish this book go on an do Kaplan, and I will guarantee you a good score in your GMAT.

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Rating: - Be Careful What you Trust
Having spent 30 minutes studying out of the Math review section, I found considerable errors similar to others who posted. I've found 7 in 20 pages. Come on.
The errors go beyond having "x2" instead of x^2. The errors go to basic concepts that if a trusting reader were to follow, the test-taker would be in trouble. Sometimes the diagrams don't match the word descriptions. In the review of coordinate geometry, the equations given and the graph representation are way off. If you don't have your high school notes handy or are a little more than rusty, this could hurt you.
While I'm sure the rest of the book is helpful, I am giving this 1-star because it smacks of laziness and it's kind of insulting. It's troubling to think that these mistakes are acceptable for an organization that administers a major graduate admissions test. We wouldn't get into B-schools with errors like these.
To the GMAC: take notes from the LSAC, and leave the test review to the pros.