My personal faves (1st couple are my favorites - the rest are my impressions for places I like):
CLT -at the C/D junction - big ol' room with great staff
CLT -on B - sometimes the same staff I see at the other Club - that bartenders at both clubs know me - which tells you I'm there too much, or am just memorable (yeah, right)
DCA - like the way it looks over the field and the interior of the terminal
LGA - reminds me of the UA domestic RCC at SFO (yes, not as nice, but similar)
RDU - Much better than the old club - and I like the staff
GSO - Don't get to use it as much as I used to - but like what they did with it during the major renovation
BOS - I think I always see it in some of the pages on the Club in Attache - big feel to it, plus the staff (on a Saturday afternoon) had no problems letting use the DirectTV remote to turn one of the sets to a Duke game
PHL - B/C - big as all get out - I prefer the A-West Club to that one