Haven't flown Airtran to MCO yet. Have friends that have.
They enjoyed the flight, no complaints about the service, flight was on-time, etc.
The consistent complaint is that Airtran does change their schedule a lot more frequently than NWA or Sun Country.
Sun Country...I can't think of a recent time they have changed their schedule.
NWA...I haven't had a flight change to MCO in a while...but when I do, NWA is very prompt in emailing me that a schedule change has happened. Usually, it's a few minutes here or there and my seat assignments haven't changed. On the occasion that the flight has significantly changed...as in eliminated from the schedule or an aircraft change...I still get the email with the flights they changed me to and a note to call if the new schedule doesn't work. They have always accommodated me on a schedule that works for me.
Airtran...they don't notify you when the change happens. You have to check the schedule, especially if you book pretty far in advance. They have, in some cases, moved their one non-stop flight time around from 9am departure to 2pm departure. So if you have plans for your arrival day in FL, you need to consider that. My friend who flew last October, their non-stop was completely eliminated from the schedule on their departure day. She didn't know until she checked the schedule. They were able to change their dates around, but it was a hassle.
One thing I do like on Airtran is they do have a 2-seat row. So having an aisle and a window seat and no one in the middle is nice when you have a 4 person group. I sat my kids in 2 seats so they could watch their DVD and my Dh and I sat behind them on a flight once. Nice.
I have dealt with the hassle of this type of situation with Delta because the price was right. However, having done that, for me, I'd have to save a heck of a lot of money to deal with that again. Just my opinion.