No, I have not tried any of these courses yet, but the prices seems to be right, even if true college credit may not be granted for completing the courses.
A good portion of my down time is used to study. Of late, I have been studying
financial accounting and
day trading. Books in the truck are being used for that. After I reach a certain point in self-study of financial accounting, I intend to complete at least one and probably two college financial accounting courses for credit.
I have a college degree. While I continue to rejoice in the liberal arts education I received (double major in philosophy and history), I regret that I shunned a formal business education as a young man. With the internet now here, I can make up for that shortfall with self study and taking courses online.
So, no, I have not tried the college courses listed above, but, yes, I intend to complete some for-credit college courses in the future.