I've used it for my past sections and think it has been useful for me. I just started FAR and think it will probably be most beneficial to use for this section in my opinion.
Jeff does a good job at highlighting important areas and noting when things are a MUST KNOW for the exam and what to expect, etc.
Is it needed in order to pass? Probably not. But I actually don't mind it on my commute to work or just going for a random drive around town when I need a break from the computer screen and letting the audio play.