I got the book. Signed up for the website. Then didn't have time to study for a while because of work. When I finally had time to use the book and study, my internet access (where a lot of important suppliments are) was cut off because it was passed the assumed amount of time. I tried getting it restored, but Kaplan was no help.
1st-They kept connecting me to the wrong departments who were too busy to talk, so took messages and never returned your calls.
2nd-Didn't respond to emails
3rd-After 4 days of trying to get in contact with the right department, I found out at Friday at 6pm that the people who could help me are closed from 5pm and the whole weekend. So now I have to lose another 3 days. This is very frustrating for someone who has to work and is limited with time. The phone opperator said this is a common problem but Kaplan does not care to spend the money to have employees over the weekend.

DO NOT USE THIS BOOK, THE SERVICE THAT COMES WITH IT IS TERRIBLE!

First of all, I'd like to thank all of you who posted reviews with reassuring stories of scoring in the 500's on the Kaplan tests, only to break into the 700+ territory on the real deal. I used this book, as well as the Kaplan GMAT 800 book to prepare, followed by the GMATPrep tests in the final week before the exam.

I found the preparation material to be quite adequate, without being too tedious. However, the extent to which the tests on the CD undershoot one's actual scoring potential is completely ridiculous. After scoring 570 on the first CAT, I was reconsidering the whole idea of business school altogether (before reading the posts of other reviewers). My subsequent scores were 560, 600 and 640, after which I scored 760 and 730 on the 2 GMATPrep tests. My actual GMAT score ended up being a 750. On the bright side, I certainly appreciated my real score a whole lot more after being humbled so severly by the Kaplan tests. On the other hand, the stress from the whole ordeal probably took a couple of years off my life:) So in sum, the book provides good GMAT preparation, but use the tests at your own risk!

this is a good resource. I have not taken my GMAT exam yet..but so far this material has helped me tremendously

The Kaplan book is helpful in that it gives you extra problems to work and tests to practice with. The tests really are ridiculously hard, and should only be used to practice your timing and get used to computer format testing. I found that the Princeton Review book was more helpful if you want to read through something and review math and verbal concepts. The math problems in the Kaplan book (and the PR book for that matter), are not worded or set up quite like the ones in the Official GMAC guide or the GMAT itself, so go ahead and do the problems in all the study guides, then spend the last few days before your test date to go through the GMAC book only. This will get you used to the types of questions, how they are asked, and will help you to recognize the answers they are looking for. The GMAC practice tests are easier than the real thing, especially if you have done a lot of their questions previously. I had gone through a good portion of the Official Guide before I took them, and could recall all of the verbal sections (the math was a little harder to rememeber). Here is what I got on the tests for all the study books:
Kaplan: 560,580,540,550,600
PR: 560,590,650
GMAC: 730,710
....Then on the real thing I got a 680--disappionting considering I was looking forward to a 700+ according to the PowerPrep tests. Then I decided to ONLY study the newest editions of the Official Guide and review the older edition. I went in for my second crack at the test and got a 740. So, do the Kaplan, do the PR, the Baron's or whatever you chose, but don't forget the importance of real test questions (GMAC guide)!