I listened to all the audio files (about 1 hour for each subject). I thought it was pretty good especially for slow days when you just want to relax a bit and still be productive.
I wouldn't say it's an essential study source, but it's still good. I only wish it would cover more material, there are a lot of high yield topics that aren't covered at all.
What I especially liked was the "power review" section because it reminded me of very high yield facts that I had forgotten. I'm probably going to listen to that section again the day before my exam.
You can buy the audio alone if you don't want the book:
http://www.amazon.com/gp/product/07...=1789&creative=390957&creativeASIN=0781765544