My airline of choice when flying to Vegas from the LA area. So the terminal Southwest is in, is one that I am very familiar with. There are a lot of food choices, gadget kiosks, decent amount of seating (although we could use more) and there are slot machines. It is Vegas after all.
As far as the airline specifically, it has been real good in my experience for the most part. There have been some delays at times but it's almost unavoidable given the amount of flights and people that go through McCarran. The employees from the ticket counter, the gate and the flight crew always have a great attitude. I am thankful to feel safe and as secure as can be when flying with Southwest. Complimentary drinks and snacks (peanuts/pretzels) are nice. All we need are tv screens and charging stations at each seat back and we're golden.
Make it happen SWA.