I haven't steered anyone toward or away from interview prep, do what your gut tells you - but it is not a difficult interview. It didn't even cross my mind to do the interview prep, but I talked with numerous pilots about the experience. I, for whatever reason, felt prepared and relaxed about the F9 interview without a lot of hassle in preparing. I truly felt going into it that it was me they were deciding on, not my knowledge or background. Because of that I felt like there wasn't much I could do other than be myself and see where that got me.

Based on the type of person you are and how you present yourself, you either will make a good impression or you won't. Just like when you sit down in that seat next to the guy or gal on the other side of the cockpit for the first time. If you're disinterested, reserved, fake, etc; it can be sensed. That's my opinion. It is way more about who you are and how you interact than anything you can study.