The content of this prep book is divided between 54 "Perfect Tips" and 10 practice tests. The bulk of the book (over 300 pages) is the practice tests. I am unimpressed by the tips. He included a few I would have left out and failed to include a few I would have added. There is targeted practice for each tip, which I appreciate, but the explanations are minimal. I am, however, somewhat impressed by the practice tests. I've only done the first two so far, but the problems are interesting and they "feel right." I will caution the reader that in most non-College Board SAT books the tests tend to deteriorate as you go through the book. That could be true for this one as well; I don't know, yet.
As tests, they might not give you an indication of how you would do on an actual SAT: I feel like the mix of problems skews towards the more difficult ones. For students trying for a top score, that could be a good thing, but a more average student might get discouraged. I do plan to add this book to my arsenal of test prep materials, but I won't use it with everyone. I can, however, recommend it for the confident math student.