Yeah, Spirit from Atlantic City has never been a problem for me. I guess I've been lucky. But I don't doubt the complaints I hear from various sources about poor customer service when something goes wrong.
But many complaints seem to be about baggage fees, seat charges, and other fees that people claim are "hidden." Not legitimate, IMO, because those people never bother to research or they skip over those parts during the booking process. Spirit is definitely not for everyone, but can be very beneficial if you know what to expect.
My most recent trip was from Newark using United, however. Had to use United before my frequent flyer miles expired. Most of those United FF miles are really from Continental, and some of those might even be holdovers from Eastern!
Jim