I just finished working through this book and took the actual GMAT yesterday. Essentially, this book does not differ substantially from Kaplan's GMAT 5th edition in the difficulty of its problems or strategies. Kaplan has taken previous material and remarketed it in an effort to appeal to those who wish to score very high on the GMAT. While the marketing is compelling, the material is not worth the purchase. I would stick to Kaplan's GMAT 5th edition, which includes a CD of workshops, drills and practice tests that are very helpful(and include a broader array of advanced material than this book).