Pros - Thorough math review from A to Z in the review books
. Effective test taking strategies. Abundant solved examples. Numerous practice exercises. Great practice question bank in basic and advanced workbooks. As with most books, you are expected to already have a good knowledge about the various match concepts, but with these books, you can literally start from scratch and reach the most advanced level of the GMAT.
Cons - To get the best result from these books, you have to invest in buying several books (set of 10 books), but if you compare the cost and benefits, the benefits outweigh the cost, or you can buy a few not all. Missing the verbal section. This is not a good option if you are looking for a very basic brush-up. Recommended for serious test takers who have enough time for preparation.