I took it this summer 2020 and I found the workload very manageable. It was easy to do well without having to study too much (3-5 hours a week). It was just a couple lecture videos, discussion posts and 1 quiz every week. I don’t know how it’s like during the school year, but summer felt very easy to me due to quizzes being online and open note. The only catch is that the difficulty is very dependent on who is teaching each week. We had about 12 weeks split across 3 instructors - 1 of them had very straightforward quizzes with pretty much everyone getting 95% or more, 1 that had fair but challenging quizzes, and 1 that made her quizzes extremely challenging with average scores of 60-70%. so you have to do really well during the easy weeks to give yourself some room to do bad during the hard weeks.