I think it depends on what type of learning works best for you. For me, I did watch some of the lectures and try some of the practice quizzes before my coworkers cd expired over a year ago.If I had paid $3,400 i know I would use only 10% of the material, because what works for me is staring at the book and reading things over and over again until they click.
far 10/28/2010 - 73 didnt finish test at all!!! ; 5/10/2011 - 83
aud 11/12/2010 - 77
reg 11/23/2010 - 90
bec 11/27/2010 - 81