Others say...

"gmat quantitative review"
This book is just a copy of one part of "The Official Guide for GMAT Review, 11th Edition". If you buy that then you shouldn't be buying this book. It is just a waste of money.

"Honest Review of GMAT Books!"
After going through all the GMAT books, here is my honest opinion about some of the most popular GMAT books:

Official Guide:
Pros - Excellent source of GMAT questions. Very well organized with real test like questions.
Cons - No review of any math content or test-taking strategies. Not enough explanations of practice questions.
Overall, the Official Guide is a must have for all test-takers. It will give you a good idea about the type of questions to expect on the GMAT; however, if you need more than just a bank of questions, you need to look at some other source.

Kaplan:
Pros - Good for additional practice questions as a supplement
Cons - Review of math content is not thorough but just the very basics. Not enough explanation of test taking strategies. Full of guessing techniques with no real mathematical solutions. Not good enough explanations of practice questions. Unrealistic questions.

Princeton:
Pros - Good for additional practice questions as a supplement
Cons - Review of math content is not thorough but just the very basics. Not enough explanation of test taking strategies. Full of guessing techniques with no real mathematical solutions. Not good enough explanations of practice questions. Weird sense of humor.

Barrons:
Pros - Good math review. Big list of questions. Good test taking strategies. Very well organized. This is by far the best of the all-in-one kinds of books.
Cons - Although the book has a good math review, it doesn't go deep enough into each concept. Not enough explanations to practice questions. Does not have a good section for logical reasoning (permutation, combination, probability, etc) questions, which is one of the most important question-type. Does not break down the concepts/questions step by step.

EZ Solutions (set of 9 books):
Pros - Thorough math review from A to Z. Effective test taking strategies. Abundant solved examples. Numerous practice exercises. Great practice question bank in basic and advanced workbooks.
As with most books, you are expected to already have a good knowledge about the various match concepts, but with these books, you can literally start from scratch and reach the most advanced level of the GMAT.
Cons - To get the best result from these books, you have to invest in buying several books (set of 9 books), but if you compare the cost and benefits, the benefits outweigh the cost, or you can buy a few not all. Missing the verbal section. This is not a good option if you are looking for a mediocre score or just looking for a very basic brush-up. Recommended for serious test takers only.

Some of the other books has no real content; whereas, there are some other books that I haven't yet had an opportunity to review, but may be some of them are good supplementary aids.

I hope my review will help some of you in making the right decision.


"GMAT"
I received this book very quickly and was able to raise my score 200 pts.

"Definitely a great study aid"
Received the product quickly and in reasonably good shape (no thank to the USPS)
I also have the the bigger GMAT study guide. The combination has really helped me to get in the groove of what type of questions I can expect.
If you have test anxiety, don't do the guide!! Take the class. This will only help you if you just need the exposure to test questions. If you freak out at tests, take the class so you get the total experience.

"good"
but i do not encounter any problems from this book in the test at all.