I used to love flying Southwest, but after flying Virgin, I am now a little spoiled. I do love the free bags and free flight changes and cancellation. One big dislike is if you have a credit on a flight, it has to be YOU that uses it and you have to FLY out by the expiration of the credit. Not just purchase the flight by then. When I first found that out, I was really annoyed, but I took a last minute trip to Vegas and it ended up fine.
Their new Rapid Rewards system is another negative in my book. Well, I guess it's not so new anymore, but I wish they had converted all my old points into the new point system instead of basically making them useless. Oh well. It's Southwest and it's cheap. Good for short flights. Anything over a couple of hours I'll fly another airline.