I came here from an AQP airline. The level of difficulty between AQP and Spirit's system is night and day. With that being said, every pilot in my class hustled and passed the oral and checkride on their first try. 8 weeks of training jammed into 5 sucked but we made it work. There was a class that was starting towards the end of when we finished. Every night during indoc I'm pretty sure they partied and the washout rate ended up being some crazy number.
The training is difficult but it isn't impossible. No hand holding at Spirit and honestly that is where I feel the real company interview happens.