I posted this recently but will post again.
We were due to fly out of AC at 6 am.
They changed our flight to 5:37 pm.
I don't see well to drive at night (we would've been landing at night in an unfamiliar place), especially when I'm not really sure where I'm going, so I called them directly (and I had booked through a 3rd party) to change our flight to 7am (same day) but landing in Ft Lauderdale. No issues whatsoever, and was told that if there was a price difference, I would receive some type of credit. (I was renting a car so didn't matter to me where I picked up the car, and there was no price difference). Dh (6'2) and ds (6'4) didn't say they were uncomfortable (again 2 hours 20 mins, no biggie to us). The plane was fine, we all took a backpack (squishy) bag that fit under the seats in front of us, we had one carry-on (on the way down) and one checked bag (on the way back) that I paid for well before the flight (cheapest way other than being a $9 Fare Club member, pay at least 24 hours online before the flight, cost me $30 and $35). I got a drink and a snack (cost $4, the same as in Wawa or Starbucks I'm sure).
Both flights were good (landed a bit early as well). No problems, will fly them again, have been flying them for a long time.
Maybe AC airport helps, though; it's a nice little airport!
If you can really save that much money, give them a chance.