If you just want basic travel from point A to point B than Spirit is about as basic as you can get. You pay for your carryon and your checked baggage. You can take one
personal bag like a purse. It has to be a certain dimension so read the fine print.
I have long legs and my knees where pressed against the seat in front of me. No way to really get comfortable. It was a 2 1/2 hr flight. Any longer and I probably would have needed help unfolding my legs.
The check-in was organized and pretty easy. The personnel were friendly.
I probably will fly Spirit again, but on a short flight only.