i took the free one a QU. it's only 2 lessons, but i got an idea of what it's like. not bad. there's a discussion group that you can part in afterward and ask questions that are immediately (i think) answered.
i wasn't that interested in the topic, but i can see that it would be good for a topic i wanted to learn about.
HOWEVER, for the price of a class, you can buy a book with just as precise info. maybe better. i think.
to tell the truth, i think we learn almost as much from one another for free.