As far as I can tell, by far the best lounge at LAS. Well worth the trip even if only 1hr to burn as E gates are less an 10 min away with the shuttle. At D gates its a no brainer but London flights and many to Canada go from E. Friendly staff and not too crowded when I was there.
Guesting for Cent is +2 or spouse and kids under 18. Cents get a small gift (which is a nice gesture) as well as johnny blue/champagne.