I bought it and only took 3/10 tests. Although it was good for timing, I didn't really like much else about it. The explanations were hard to understand and they seemed to repeat the same types of difficult problems, none of which showed up on the real test. I found the math on the real DAT to be very easy and straightforward, you just absolutely have to skip problems that will take you a long time. If you go into the test knowing that, you will do fine. My scores were 16, 18, 17 and I got a 17 on the real thing, so maybe it is a good prediction of success.