I took this course a few months ago. Not bad at all, I was worried about it because math is not one of my stronger subjects. If you read the material and remain actively engaged you should have no problems. There are quizzes each week (only 10 questions long) and minor individual assignments.
I got a sample syllabus that looks like a ton of work. Group assignments, power points, etc. Was this the case when you took it? The syllabus was not cut in stone, just a sample. Did you have to spend 20 + hrs/week on it? Thanks for the details! It's spendy so I don't want to bite off more than I can chew.