This is a great buy if you have a good understanding of Japanese grammar, but need to add more words to your vocabulary. Before you buy this program, listen to the Audible audio sample - the entire program sounds like that. I don't mind the "no frills" approach, but I can see how it might drive some people batty. You can also see WHAT words you will learn by previewing the PDF file that comes with this program before you buy it.
Overall, the words you will learn are very useful. There are a few "duds" like floppy disk and magnetic tape, but most of the words are worth knowing. As you can see from the PDF file, the words are only written in romanji. So if you are a person who learns with kanji, then this might not be a good fit for you.
The one thing I wish Audible could have done with this book is make the chapter markers at more convenient places. The first half of the program has chapter markers at the beginning of new lessons, which is great, but the last part of the program has random chapter markers, so it's hard to get to a specific section. The content of the program is solid though and once again, I would recommend it to someone who is looking to add more words to their Japanese vocabulary.
The music has a mellow, ambient sound and the two narrators, one Japanese the other English, have soft, pleasant voices. Because the album is audio Prozac, you will be able to listen to it over and over again and pick up vocabulary and phrases. It's especially useful for learning prepositions, because you hear them so often, that you start to hear what "sounds" right.
Some of the other Japanese programs I've purchased on audible are good, but I don't want to listen to them repeatedly. Earworms is palatable enough to listen to again and again and, of course, that will help you remember.
The Learn In Your Car series consists of spoken words and phrases that you hear and repeat twice. If you have already taken lessons it is very good for vocabulary building, but I don't think it is at all useful for learning from scratch. You could play the lessons forever and not get a sense of the structure of the language. If you really want to learn how to speak Japanese from scratch in your car you need the Pimsleur system.
I'd rate this title 1 star for learning from scratch but 5 stars for learning vocabulary... so I'll compromise and give it a 3.