I have been a Southwest-er for years, not really by choice, but because they fly from Burbank to Vegas all the time. Southwest was really a choice motivated by convenience.
However, I recently had the opportunity to fly Jet Blue from Vegas to Burbank. Its cool that they are flying non-stop to Burbank now, as Jet Blue is really a LOT better than Southwest as far as service, planes, and amenities go.
I love the fact they have TV and XM Radio for each individual seat. They offer head phones for $1 if you don't have your own. The seats are way more comfortable than Southwest - bigger, more leg room - and they give you a FULL CAN OF SODA and a snack - not just a cup of soda and peanuts like Southwest.
I'm not giving them 5 stars for two reasons:
1. The flights to/from Vegas are MORE expensive than Southwest.
2. The convenience just isn't there. There is only 1 (or 2) Burbank to/from Vegas flights per day.
I would definitely fly them again though!!!