This method is really great. I got it from my Norwegian tutor as something to practice with while I was driving, in addition to the books that I was already using. I quickly found that it was actually helping me progress more than the books were, and I ditched them for the time being. The gist is this: I'm about halfway through, and I can have a basic conversation in Norwegian, and understand a little bit of what they're saying. Nothing more, nothing less.
As other people are saying, the idea here is that they teach you a few words, and then ASK YOU (rather than just having you repeat) how to say phrases using the words you learned. As time goes on, they incorporate more and more words, and you begin to respond in conversation. Eventually, the directions start being said in Norwegian, and it's pretty solid immersion. Like the book says, if I am not able to answer the prompts in the time allotted (which gets shorter), then I repeat the whole lesson the next day. I also like to look up the words after the lesson, it helps me to remember if I know what they look like and are spelled like.
-You begin speaking quickly
-The things you learn, you retain well
-It is cut into manageable chunks
-You don't learn how to spell or read the words you learn
-Repeating lessons (which I recommend) can take a lot of time
-Of course, as others have said, there is nothing beyond this. But that is a testament to how great these CDs are.
To sum up, this is a great set. It quickly introduces you to many of the basics, and gets you going. If you are looking to speak and be spoken to, this is a must-have and a good investment of time.