Going over the chart I have been to every airport with a United Club and every Club at each of these airports since first joining the Red Carpet Club in the mid 80's.( That said I have not been in the new FLL location this month). I have been to several that have closed such as FRA. I am Cle based and seen 3 different Clubs for Cle over the years.
My favorite Club of the new versions Domestic is the LAX location followed by BOS and ORD (F terminal). Of the older locations I like Cle and SNA. LHR is the best of the few International locations. I like the 2 Polaris Clubs ORD and EWR that I have been in.