i was working with the bibles, but it was difficult for me to be motivated. i enrolled in the course. a lot of the coursework comes from the bibles, so you don't need the bibles if you take a course, but it's nice to have the bibles since they go very in-depth so it's good to have if you're particularly struggling with one area. also, i write all over my books; so it's easier to have another book then erasing all my work.
the instructors are awesome (i have brian and don). one teaches the course and one answers private questions---that's my favorite part because the instructor doesn't have to slow the entire class down for one student.
and the archive courses are great. i go back and look at specific lessons that gave me difficulties.
oh, and it def. was not a waste of my money.