TSA pre works fine on F9. Compared to WN which boards 30 min prior to departure, F9 boards earlier so be at the gate 45 minutes before departure. Frontier works great when everything works. When their is a problem, that is when you have issues. Frontier doesnt do flight credits if you need to cancel your flight and has been prone to cancelations more than SWA. Also, if you are not paying for carryon, you can go on Amazon and buy a bag with the exact dimensions that F9 allows for a personal item for $15.