Reviewer: A reader from Virginia USA I used the Audio Osmosis CDs, my textbooks, and AAMC practice tests for self-directed MCAT prep. In my opinion, A.O. is a great bargain; I am very glad I "took a chance" on it rather than blowing $1K+ on a prep class. All I wanted, and what I got from A.O., was a clear, concise refresher of the science covered on the MCAT (as a post-bacc premed, my general chem and physics are about 7 years old). To boot, they also give a useful "strategy" for the verbal reasoning section - worked for me.
In short, I found Jon's description hits its mark: the CDs condense many major concepts into a series of compact, conversational lectures (and they're portable and repeatable). Dense topics are frequently leavened with humor and goofy sound effects - these also generally make factoids and rules-of-thumb stick in your head. Please note that a few errors slipped through, you'll probably catch them, but you can also check their website for the short list of errata. Finally, the authors support their product(s) personally via a bulletin board system on their website.