According to google there are about 6 threads on HBT about this course and this has the most posts, which is why I have come here.
I have done the course and all the assignments and now await the final exam. I have to do very well to pass as my average grade so far is around 60% and you need above 70% to pass, but I will still give it a try.
I studied chemistry in my first year at university. I did well at physical chem but sucked at organic chemistry, which the OU course is mostly about (as well as bio-chem). I have gone from being very conscientious to, as I realised how little chemistry I actually remember, doing the bare minimum. It hasn't made much difference on my grades!
It has still been a very worthwhile course and use of my time. Even if I don't need the technical chemistry knowledge, the high level understanding I have gained from just watching the videos and scanning over the course materials helps me understand and process technical articles on brewing (and discussions on HBT).
I am interested to others' experience.