I just flew on a new 737 Max 8 from DEN to MSP. The plane itself was pleasant, but my 3-hour delay was not. I honestly still enjoy flying southwest, because I am a carryon only traveler.

Also, the AMEX Centurion lounge in concourse C at DEN was an absolute mess. There was a ~45 min wait to get in and it look very full. Not quite shoulder to shoulder, but very crowded. I just sat at my gate and watched TV on my iPad instead.