I am surprised to read all these negative reviews. I own Master the Gmat, the Official Guide 11th edition, and the Kaplan 800. And let me tell you something: none of them give you a comprehensive review of all the aspects tested by the GMAT. Master the GMAT's verbal section is weak but it has by far the best explanations on geometry and coordinate planes, giving you formulas that I have not found anywhere else (like the formula to calculate the area of a rhombus). Also the lesson about exponents is one of the best I have seen and the math exercises are very realistic and similar to the ones you'll encounter in the real test. I have taken it twice so I know what I am talking about.
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