Never bought this product. However, I was very much interested because it is relatively cheap. If you have the time and if you've run out of materials to study from, I wouldn't hesitate to try it. However, the tried and proven materials include Kaplan, Achiever, Topscore, Barron's and Destroyer (never used this one). With the previous four (Kaplan, Achiever, Topscore and Barron's), I was able to score better than 99th percentile on the DAT.