Great discussion here.
Regarding the F9 upgrade, another consideration should be the excessively steep rate curve at Frontier. Our 12-year captains were the only pilots brought into the pattern when our contract passed. According to APC the United A320 captain at my longevity makes $50.00 more an hour than I do. That is a significant amount of earnings and retirement contributions.
I would not trade rates for a commute, however, and it's a good job if you can avoid having to go to work to endure the bad joke that is trying to operate a normal flight. (Sounds like that's all airlines to some extent.)