Online Learning

I'm seriously thinking of taking the NGS's online course on "Using Census Records in Genealogical Research". I hesitate because it's $35 and I feel I know quite a bit about the US Federal Census records already, but maybe I don't know as much as I think I do. Passing the course gives a $30 discount on the 18-month $495 Home Study Course in American Genealogy, which I'm pretty sure I will sign up for once we move to wherever we'll be moving to at the end of this year, so then it's really only $5. Anyone out there familiar with these courses?