This new book is nothing but a condensed form and repaged version of the already out of print "Big Book", edited by the same ETS a long time ago. And being such, simply just don't waste your time and money if you can have any kind of access to the "Big Book". All of the seven REAL tests of this "brand new" book are already contained in the Big Book (and the Big Book has other 20 tests!).
First of all, this is a stale dated material! The old Big Book, used to disclose the period when the tests were taken: between 1980-something and 1994 (this "brand new" one does not even mention it!). But since then the difficulty level of the GRE Quantitative Section has raised its bar several notches up! So if the reader is purchasing this book with a specific focus on the Quantitative Section, chances are that she or he will feel tremendously frustrated.
However, the same cannot be said of the Verbal section questions. The old Big Book and consequently this new book are good sources of real-type Verbal Section questions, as such Section was already VERY difficult back then and things haven't changed that much as of October 2005. Despite this, it's good to remind the reader that ETS is planning to change the structure of its Quantitative and Verbal Sections of the General GRE Test for 2006, turning into obsolete even the real Verbal Questions of this book. (But likewise, even with such ongoing planned changes, ETS is also considering how to improve the preparation material for GRE).
The only good and really new thing about this "new" book is the Quantitative Section Review material where they mention how to obtain basic descriptive statistic concepts that test takers mention to have been finding so much lately in their real GRE questions. Nevertheless, two points should be raised on this topic. As a matter of coherence, the tests of this book SHOULD contain such type of questions, otherwise test takers can be wrongly misled and feel that including such topic to be revised is nothing but pure ETS terrorism since it is revised but by the new book tests it wouldn't be on the real test. And this is so not true! The other point to make is that, although this is relevant, it is also true that such new revision material can also be downloaded for free from the very ETS website.
Finally, I would say, that this material can only be good reference for other reasons than the above mentioned only if the purchaser is in her or his very early preparation steps, trying to familiarise her or himself with the type of questions. But let's face it. The purchaser could also have a glimpse of what is about to face in the real GRE by studying by whatever other updated book, software or online preparation material.
To conclude with, this book should only be bought if the purchaser really doesn't have access to the old Big Book or if the purchaser intends to buy as much material as possible and this one is only in her or his portfolio of material to be studied. As a solo buy, it is a real waste.