Pain and necessity often coexist. That statement exemplifies how I feel about this guide (in an over-dramatic way, I admit). I would recommend attaining a copy of this book if you want to score high on the quantitative section of the GRE, as it contains a lot of practice problems provided by the test-makers themselves. The writers of the book split the questions into four types (arithmetic, algebra, geometry, and data analysis) and they also include two mixed practice sets. The overview of the test and the appendix also come in handy for prepping for the exam.
A minor downside: the book only provides strategies ETS would approve of, which sometimes meant more raw complicated mathematical configurations than necessary, in particular if you employ strategies from sources like The Princeton Review. Still, I would recommend this one to anyone searching for more preparation for the quantitative section of the GRE. For the sake of full disclosure, using this guide and the aforementioned Princeton Review guide, I scored a 159 on this portion of the GRE.
While I didn't read all of it, the practice questions and the two tests on cd really really helped me to prepare for the GRE. Since the people who write the test, write the book, you can be sure of getting accurate information about the test.
Pretty informative, seems to cover all bases as far as the GRE quant section is concerned. Of course, it's efficacy can only be gauged once I actually take the test, but it served as a good revision of the basics.