I'd recommend this book for anyone who needs a good math refresher. This book is in an easy to use format, starting with easy material and progressing to the more difficult from there. Each section contains a brief (but good) explanation followed by a fair number of practice questions. Don't look for any long-winded explanations in this book, it is a refresher, just as they say. Also, it is printed on good stock, so it holds up nicely. I took mine cross country with no problems, unlike the review books printed on newprint which didn't fare as well.
The biggest problem I encountered with this book is that it does not contain any test specific questions such as the GMAT's data sufficiency questions or the quantitative comparisons on the GRE. If you are looking for practice questions, this is not the book for you. If you want a math refresher, this is the book for you. If you are particularly strong in math, you probably won't find this book very helpful, unless you want to do basic math problems, out of test format. I used this book as a math refresher, then went on to one of the other review books for specific question practice. That combination seemed to work for me.