I love flying Southwest. Unless I need to leave the country (which I never do) it's the only airline I fly.
I hadn't flown in a few years but I found Southwest still quick, still mostly punctual and still fairly friendly. My flights were delayed by about ten minutes each which considering the recent storms, I wasn't too shocked about.
The only recent negative change I've seen is that they seem to now reserve the A class boarding for frequent fliers. I've checked in within 10 minutes and still been B class. Not sure why or if paying the $12.50 for automatic check in gives you the A class, but it's definitely something to be aware of.
Both my flights to and from Vegas went off without a hitch and both were easy and simple experiences
I love Southwest and they'll continue to be the only airline I'll fly.