I didn't do any interview prep other than reading the JetBlue Wikipedia article, browsing some financial docs, reading the forum, and looking at willflyforfood interview profiles for some tmaat questions and learning the SAR format. I don't think it is a waste of money to pay for interview prep, especially if you aren't confident in your stories and ability to interview, or aren't able to internalize key info from the Internet and financials. I've talked to several people who blew the interview the first time, paid for the prep the second time, and got it. That costs a lot of seniority to wait 6 months for a retry if you are so lucky. That said, I wouldn't have paid for prep for a JB interview. Maybe for a delta or similar interview with multiple tests that have a direct bearing on your success. JetBlue evaluates how you answer questions in a prescribed manner, as well as your likelihood to bail, and your personality. I don't need a $400 consultant to tell me that.