I've flown Spirit a few times. Never had an issue and thought it was a good value. Plenty of complaints about the airports involved - especially FLL.

We did our research and found carryon bags that held all our clothes for a week and fit under the seat so no bag fees. Picked the exit aisles for more leg room and that's where the flight attendants sit and they're always interesting to chat with.

Have even flown them internationally without a problem.

Not sure I'd do a long cross-country trip or Europe with them, but they're fine for a couple-hour flight.