I took my DAT today and I'm glad to say I'm finished with it, lol. I took the Kaplan OnDemand online course, along with Chads videos, Dat Destroyer, Cliffs AP Bio, and Crack DAT PAT. I found Chads Vids, Crack DAT PAT, and Destroyer to be the most helpful. The Kaplan course was good for all the practice tests and questions, but the actual lectures were very basic and not very detailed. If you do choose Kaplan, definitely supplement it with something (Chads, cliffs, destroyer, etc) especially the PAT section... All in all, I thought Kaplan was overpriced for how I used the material, but I'm not sorry i purchased it. But if money is a major concern, as mentioned in other posts, stick with the tried and true methods.