I will be traveling to Greece in November, so I wanted to learn a little basic Greek to be able to communicate. I had planned to purchase just the phrase book, but comparing prices for the phrase book alone and the phrase book & CD, I got the latter for just pennies more. What is included on the CD are those phrases that the book describes as "essential." I've also purchased a second guide to learning Greek that is audio only: CDs, but no book. I know that people have different learning styles, but for me, being able to see in print what is being spoken on the CD is very helpful for purposes of retention.
The phrase book includes a simplified pronunciation of each Greek phrase, so some might opt to purchase only the phrase book. I do have a minor quibble about the phrase book. Sometimes you will see different spellings for the simplified pronunciation for the same Greek word. The different spellings still result in the same pronunciation; I've just got this thing about the importance of consistency. I do believe that once in awhile, the pronunciation gets the wrong syllable accented. (I'm hoping others more knowledgable about Greek will indicate whether I'm correct about this.) Unlike in English, in Greek, spelling explicitly indicates the accented syllables. This is important. Two different Greek words can share the same sequence of syllables, only differing in the placement of the accent. Even if I'm correct, I don't see this as a reason to give less than five stars for my rating; one just needs to pay attention to the accent marks in the Greek.