I only used Aviationinterviews.com. I also talked to several buddies that had interviewed in the last year to get the full scoop. None of them suggested to use the paid prep services. IMO, using just these resources should give you all the information you need unless you are just extremely nervous. Then the paid prep may give you tips on staying calm during the interview.

I hadn't interviewed anywhere in over 17 years and I got the job. I got the impression during the interview that they know you can fly and can be trained, but really want to find out if they would like sitting next to you in the cockpit on a 4 day trip. The key, again just my opinion, is that you must turn on the charm, and prove to them that SWA is the ONLY place you want to fly at for the rest of your career. You must also be a lady or gentlemen using you absolute best manners. That means standing to shake hands, standing until the interviewer(s) is seated first, looking them in the eye, etc...

Also, the person that did my logbook review said that he can tell in the first 5 minutes if the interviewee really wants to be there or not.

Hope this helps somebody.