I'm studying this book and CD package alongside the official course material as I felt I needed some more basic grounding in Portuguese.
This CD and book does this wonderfully well with one caveat. Beginners in a language need hand-holding, it is true. To be able to understand the spoken word, the material must be crystal clear, distraction free with articulate speakers. This CD does this wonderfully well but slightly to the extreme.
I found that by speeding up the material to about 135% of the original speed it sounded a bit more natural and was a good introduction of what you might expect in real life. No native speaker would ever speak as slowly as the people on this CD, even if they were trying to!
Windows Media Player allows you to control the speed of playback (once ripped to MP3 format) so you can slow it down even further if there's something you can't quite catch, or speed it up as suggested above.
I can play this CD (at the faster speed) time and again in my car and get real benefit from it. I don't regret the purchase at all, just wish they would perhaps speak as clearly but at a more natural speed without me having to adjust the playback.
If you are a beginner then you will benefit greatly from this CD / book combination.