I like this course, but it certainly isn't for complete beginners. It's a good adjunct to courses which really are easy. It's the audio that's the challenge, unless you cheat and read the transcript, which defeats the purpose of trying to develop listening skills. The audio is pacy and colloquial, with about a million new items of vocab in each dialogue. I like to listen over and over again until I can answer the gist questions before reading the transcript.
I got as far as Unit 7 before finding that impossible. I've had to consolidate using other courses. I'll come back to this book, though, because I do like hearing 'real' dialogues instead of the baby stuff.