The CD is great, I play it in the car on the way too and from work and feel confident that I will be able to speak basic swahili by the time I go to Africa in August. The phrases are both simple and useful.
Do not buy this audio cd. It is of no use without the book and (not having bought the book myself) I still doubt it would make sense to anybody. All you hear is someone speaking Swahili. Someone wrote here, he listened to the CD in the car and learned the language. No way this is possible, unless your with a friend who is fluent already and translate.