OK, I just finished my first trip on Spirit, PDX to LAS.

Better gate location than SW at PDX and LAS
Crew was friendly, plane clean.
Had free under seat bag, put it above when I got onboard. No hassles.
Had big front seat, can't comment on the regular seat horror stories;
Airbus 319 was on this route, so reg. seats are not the worst (see Airbus 320)
Flight from PDX delayed 30 minutes due to onboard computer issue.
Return flight arrived 15 minutes early
Yes they tried to sell the credit card onboard, short speel, no big deal.


I was prepared for the worse (do a net search lol) but I would definitely
book with them again. Seems like a good option for someone who can travel light and avoid the bag charges. I beat SW by over $50 and there wasn't much downside other than their frequent flyer program most likely can't beat SW.