Free FSI Language Courses - Are They Good?

Free FSI language courses (from the US Foreign Service Institute) are available for download on the internet in pdf and mp3 format. LINK http://fsi-languages.yojik.eu/
Check the link to the FSI courses in the description below! Free is great, but are the materials useful? Like all materials they have their pros and cons and how you use them is important.

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Music: "Strength in Numbers" by The Passion Hifi. http://www.thepassionhifi.com/
Intro music: "Champ" by Gunnar Olsen.
Outro music: "One More" by Silent Partner.