I received this in the mail a few days ago and have watched about half of it. If you are an aspiring screenwriter, you might want to check it out. It probably won't help you very much if it is your ONLY source of screenwriting instruction (you should use it as a supplement to screenwriting classes and books that you can buy on the subject), but it does lay out the screenwriting process in a logical manner.
The DVD also includes step-by-step writing exercises for "putting together the pieces" of a screenplay. The only drawback is that you don't have a live instructor who can critique your work.