It took me 2 months to get through these 8 CDs, about one hour a day on the train to work. I found it enjoyable, and I've learned about 120 words (depending on how you count them) together with grammar rules that let me assemble sentences about the past, present and future.
The format is a native Greek speaker and professional language teacher introduces one or a few new words and then you practice using them in sentences. She asks you to say, for example, "I want a glass of wine". Then you must put the CD on pause while you think of your answer. This step is very important! If you just listen straight through you will not retain much.
After you've decided on your answer you listen to two other students also attempt to answer. They are struggling and making mistakes right alongside you, and the teacher corrects them immediately and helpfully.
Rather than giving you all sorts of rules about pronunciation, grammar, verb conjugation etc. this takes a more natural approach. You just dive right in and start participating in conversations. Everything you need to know in the way of rules is explained eventually, but at an appropriate time when you can apply it right away, not up front to overwhelm you.
If you are a professional teacher, you will know what I mean when I say the pedagogy is very solid. This means the teacher has constructed a complete learning platform for you, giving you all the knowledge you need right when you need it. There's no "we'll get to that later" or "here's a concept you won't need for three weeks but we're burying you with it now".
The very limited vocabulary you will learn is tailored for the tourist. You can order certain foods and drinks, ask for directions, and learn how words change when they refer to "me", "you", "him", "her", or "we". Greek is a language where nouns have gender, so coffee is masculine but beer is feminine. I did not find these concepts difficult even though I have never learned a language with genders like this before. It is simply part of learning each new word.
The only reason I don't give this five stars is I think it sets expectations a little too high. This is NOT easy. It WILL require work on your part. You can't just sit back and listen. And even if you go on to the advanced course (which I have) you still won't have anything close to a functional vocabulary. For example I didn't learn any colors, numbers other than one, plural words, plants, or animals in this beginners course. It is mostly big, small, near, far, here, there, open, closed, yes, no, must, can't, simple concepts like that.
Finally, you are learning to SPEAK Greek -- NOT to hear others speak it, or to read, though you will pick up a tiny bit of those as a side effect. The CDs do come with a booklet showing all the words and phrases in English, Greek pronunciation using English letters, and correctly spelled with Greek letters. The series ends with an alphabet so you could go on from there to start laboriously reading little by little.
But in short, when you are done, you will be very well prepared to ask "Who speaks English here" in Greek, which you had better do, because you won't be able to hold your own in an exclusively Greek speaking setting. This is not a negative reflection on the course as such. It is fine as far as it goes. But it just doesn't go very far.