Coursera is the only one of these bigger MOOC sites (edX, Udacity, even Udemy) I have yet to try a course from but that is going to change soon because they are

Coursera is the only one of these bigger MOOC sites (edX, Udacity, even Udemy) I have yet to try a course from but that is going to change soon because they are offering Constitutional Law with Akhil Reed Amar from Yale and even though I already graduated from law school, I'm interested to see what an online con law class looks like (and of that supposed caliber).