I am taking it now. Most materials are good, but in some cases interchangable terms are switched up, making things confusing. In addition, the clock showing imber of hours spent in the course is weird. It says I have 5 minutes left of the 40 hours of study, but I am only halfway through the material. I thought it was based on the amount of material covered rather than actual time, but I know I haven't been in the course for 40 hours.
I have found at least one contradiction between the material and a quiz question, so I wrote the instructor, who is supposed to respond in 24 hours. It has been 27 hours.