I'm A-list (getting close to +, but not there yet) and got this offer about 6 months ago, and have taken 5 RT on AirTran because of it (and the ability to flip those earned credits into Southwest points).
I've got to say, I'm 8/10 on free upgrades to Business Class on these AirTran flights, and it's a really nice product; as excited as I am about the merger, I'm going to be kinda sad to see the first-class part of AirTran go.