My family uses our travel benefits frequently and have only had pleasant experiences, when it comes to service.
My in laws traveled stby on Spirit and were treated very well.
Boarded first both ways and received seat assignments much prior to final boarding. Flights were full both ways.
As mentioned in previous posts, our customer service is excellent, especially on board, where the FAs do an outstanding job dealing with the challenges of "uninformed" passengers.
Large majority of pax leave the AC happy and complement the crews.
The occasional demands:
"Can you shut that baby up?"
" I paid too much money to walk down stairs"
are often met with patience and diplomacy.

More legroom will make everyone happier.