DH flies Airtran all the time.
The first class is nice - bigger leather seats - two by two. You get drinks prior to takeoff. One flight attendant looking after you at all times. Better snack choices (regular bags of chips, snack mix, cookies) and you can ask for more. Free drinks.
You can usually upgrade at the airport for around $49+ (I think it's $69 from BUF to MCO)and they will make announcements at the gate if anyone wants to upgrade if there is space.
You can also do this 24 hours prior to your flight - if you checkin on line.
If you've only paid for a really cheapie fare, it can be worth it. But you are paying a bit extra for first on, first off and all the free booze and pretzels you can eat!