New to the forums here, but after reading all of this on prepping for F9, thought I'd throw in my $.02. I recently interviewed a couple weeks ago. I opted to use Emerald Coast for their online audio prep only. Although I'm not typically drawn to use audio "self-help" style assistance, I will say that listening to the whole block of audio files offered from them just prior to heading to Denver did help tremendously just to get my head in the game. A more in-depth prep may have helped, but in the end, I was offered a spot in this great family of professionals. Altogether, its up to you to show your best. If a full prep helps you calm the nerves, I say go for it.