It’s strange to see so many commenters celebrating the death of a company and the loss of so many jobs.
I flew Spirit a few times. The first time sucked because it was an emergency and I had no other option. The last few flights were great. We got the large seats up front for $75 extra. That plus parking at SJC was still cheaper than flying Southwest out of OAK.
The staff were friendly, and the gate was conveniently across from a lounge, so we had a truly great experience for those couple flights to Dallas.