Thanks for the answer, but it's a bit late for me.
Actually, after the graded essays in BarBri, I did Essay Advantage. For me, I think it was helpful. If nothing else, having someone look over additional essays was a good thing. Then again, because they're both affiliated, the BarBri folks probably scare most people to try to get them to take the EA course.
You forgot the main rule for bar essays...state a rule of law. If you don't know the rule, make one up.