It's been good, as in I never could have followed this thread before it, but I don't know about the first run, but there has been little to no professor interaction with this run of the course.
Which is a bit unfortunate. I don't have any education in modular arithmetic and I can only get half of those questions correct. Being completely lost as to why the other half are wrong, and being unable to get help or worked out answers (to be able to figure out where I'm going wrong before the final) really isn't the best.
Thanks for the info.
As for professor interaction, it is a byproduct of the MOOC formula : don't expect too much from the professor, he is already teaching to thousands of students ! You'll have to manage your way through the discussion forums (who unfortunately have a lot of noise). During all the courses I took, I always managed to find answers like that.
The previous course I took with CourseRA had a decent amount of Prof and TA interaction, and the forums were well tended. But, I guess that could be down to the fact that the course was being used by the professor to instruct his actual University students at the same time.