If you use audio, go with Audio Osmosis. I have not been able to find any other product that even comes close to it. It has off-the-wall humor that makes it fun to listen to while giving you useful mnemonics. I personally only like the biology portion of the CDs because it's hard to remember equations as people are talking about them; it's much easier for me to just look at a piece of paper to remember equations. It is no substitute for reading content, but it does help you keep the basics together while you are driving down the road or working out.
Also, stay FAR away from the MCAT Audio Course on Google Play and iTunes. It's literally the most awful thing that I have heard in my entire life. It's useless.