Not bad, not great....
As other reviewers have stated, this is a good book for a broad, superficial review, however, the cognitive, experimental, and diagnostic sections are not sufficient prep for the GRE exam - they are too basic and brisk and do not reflect what is actually on the exam. I got a 730, but I did so by looking at the Kaplan book (despite its mistakes galore) but most importantly reviewing my old textbooks. It's a challenging exam, but with good preparation you can beat it. Good luck!