Found the CDs to be helpful to check understandings of concepts, but I don't recommend listening to it while driving. I tried this a couple of times. I found myself imaging force vectors and organ systems and not paying attention to the road. I can't fully study and fully drive at the same time. When listening to the CDs, driving was done automatically without thought. I coulda ran over a couple of people and thought they were sound effects of elastic collisions in my head! So CDs good, driving and CDs bad.🙂