Just a quick update to this thread, I visited The Club at the D concourse yesterday. Very nice overall, excellent and friendly service, fairly small lounge with medium crowds, lots of people leaving Vegas on a Sunday afternoon.
It had multiple bathrooms and showers too (believe those were closed because of Covid), decent buffet selection (attendant would get the items for you), and full service bar. No seats at the bar itself but tables nearby. Fairly easy to get to, I was flying out of Concourse B yesterday, so a 3 min tram ride and then about a 10 min walk after that.
