I needed to get from SJU to EWR. My options were UA at $131 per passenger on a BE fare or flying spirit at $53 per passenger.
I booked spirit for 2 passengers, paid for the big front seat and for 1 carry on bag. The total price was $177.
I bought 2 bottles of water in the airport for $5 just in case I got thirsty.
The actual flight was ok, the flight attendant were rude to some other passengers and they failed to shut the lights on a Red Eye flight.
Spirit Pros:
1) Big front seat a cheaper cost than UA small seat, PRICE.
2) Better flight timing.
3) No one checked luggage size or weight.
Spirit Cons:
1) Lights kept on during a red eye flight.
2) Rude FA.
3) Passenger character.
In general what matters to me is the seat size. As an observant jew I cant eat the food anyways, so it boils down to the seat. Spirit did not let me down, the front seat was big and comfortable although without reclining . If I were to find a spirit flight priced correctly again I would not hesitate to fly them again.