Virgin America is the only airlines that I use. To LA or Las Vegas at least. Their prices are comparable to Southwest Airlines, but the airplanes are much newer and the staff are very professional. They also have an entertainment system for you to enjoy while you fly. You can choose from watching television, listening to music, watching music videos, playing games, chatting and a few other features. All it requires for you to be able to use it are a pair of headphones.
I flew out Thursday night from SFO to LAS and returned from LAS to SFO Monday night and the fares were $69 there and $79 back. I've flown cheaper before, but I checked out that that's pretty much the going rates now. I used to check a bag in before, but just bring a carry on or two now. I was not affected by their $15 baggage check in which is pretty new for them. They allowed one free checked in bag not too long ago.
I will use Virgin America if I plan on going to any of their destinations.