The unmissable warnings don't really happen until you get to the terminal though. Admittedly, I have not used spirit for some time. But the signs that say "we don't really want you to have to pay $100 for the carryon you forgot to pay for on the website, but you didn't pay for it, so tough shit" don't seem terribly genuine.

I will never fly spirit again, though. They just straight up cancelled a flight of mine an hour and a half before the flight for literally no reason, I got no notification via email/text or phone until I went to the airport to check my baggage (another thing I hate doing, but I was traveling for a pool tournament and you can't carry pool cues on a plane...). I had to book a last minute flight with another airline and my total airfare ended up being almost double what I paid for spirit.