Just to be clear--yes, spirit.com is cheaper than most airlines. It also has the worst rating of any airline flying in the US. The reasons for this are as follows:
(a) they will charge you steep penalties if you show up late for your flight (and by late I mean if you check-in at the gate less than 45 minutes ahead of time).
(b) they try to sell you all kinds of stuff on-board at inflated prices ($10 for a Coca-Cola, $15 for a headset, no problem, how about buying a lottery ticket to see if you can get assigned seating for your next spirit flight)
(c) Think the seating is close on most flight--spirit brings that to a new level (cattle-car seating is what most call it).
(d) need to make a tight connection to another flight--hey, not our problem--especially if it is with another company
(e) will we have you wait around for an extra 90 minutes before we board you--and then change your seat five times (even after being seated)--hey that's our prerogative--and your loss.
Since it appears, jenniemc08, that you haven't taken your flight yet, I suggest you write back after the flight and let us know if you have a better experience than most. I just know my own experience with both ryanair and with spirit. Cheap--absolutely. Worth the hassle--well, that depends.
What a remarkable posting. I had no idea that Spirit was like that. You have convinced me to avoid them. I never used them before and now I never will.