"review of the audio only--not of the content"
Plenty of people have written about the content, so I will write aout the actual recorded version.
For whatever the content is worth, I think this makes an excellent audiobook. The reading is clear and enthusiastic. The sections of the book are well broken up and there is a different voice that reads the end of chapter summary, so you know where you are at the end of a section. The use of different voices is exceptionally good - I think it breaks up what might otherwise be a pretty monotonous reading. All of the voices are different and yet still expressive. While the main reader has an Australian accent, she is easy to understand; all of the other readers have American accents.
I gave it 4 stars instead of 5 for two things though:
1) the music is awful new age-y stuff. it's not at all necessary and what they picked was just terrible. it's not enough to distract from the reading, but it'll date the audio pretty quickly.
2) there are a couple of sections where the reader (the author) is clearly in love with her own ideas and you can hear the "look how amazing i am!" in her voice. it's kind off-putting in the sense that what she's describing isn't all that remarkable.