Kamil Trzebiatowski completed this course, spending 2 hours a week on it and found the course difficulty to be easy.
Great course and the gentleman Professor from the University of Amsterdam made it very accessible. Love that the course has made the entire transcript of the lectures available as a single PDF book! Comte, Marx, Durkheim, Mills... great stuff and delivered in high quality!
The final exam I found the most difficult as it contains over 80 questions, but overall not that difficult, though you do need a quiet space (so no babies around!) to understand the difficult sociological concepts!