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I used the GMAT 800 book and I thought it was super hard but it really prepared me well. I was getting about 3 out of every 4 wrong but it really toughened me up. I'd recommend it but be prepared for your ego to take a beating.
IMO if u have KAP 2005 (CD) and use GMATCLUB challenges for Math, you will not need this book. Only +ve about this book is good CR, that's all. Math is a waste of time, so are the SCs and RCs. Their footnotes, like "a 800 test taker will do blah blah", are specially annoying. KAP's idea of creating tough SCs seems to be to jumble up sentences and create ambiguous choices. They are not of GMAT quality. Needless to say that KAP RCs are not representative of GMAT RCs as well.
I bought this book after not getting my ideal score after 2 attempts. I have to say that I quite like its methodology. I've only reviewed the verbal portion, which is where I need help... but the problems are challenging and the responses insightful.
If your goal is more than 700 on the GMAT, then yes, get it.