While I was studying I would listen to them in the car on long drives. I did so much driving that I actually got through the entire playlist. That being said, I definitely agree with Feralis. The concepts are explained very clearly, so if you don't understand them it might be a good resource. However, they don't go in depth enough for actual DAT questions. Also, the speaker tends to be very long winded. You would be using your time much more efficiently by reading Feralis' Notes/doing bio questions and compiling your own notes on concepts you don't understand. Good luck studying!