I have purchased the German Edition for my daughter, and I'm very disappointed with it. It dosen't understand when you talk to the microphone and I'm GERMAN. When I had called the company to complain they said that probably my daughter dosen't speak with an Accent, but when I mentioned that I was a native German, they had offer to replace the microphone.
Well, that didn't help...
However, I do like the rest of the excercises, and find them very rigorous.I would recommend you use the free edition from the library and save yourself some money.