I stayed there on points (and am also a Gold member) from December 31-January 4 and had a spectacular room, superb service. It's a fantastic hotel with about the best location and service imaginable. Great restaurant too!
I don't know what the situation will be in summer, but as a Gold member who usually travels in Europe I would surprised if you don't have a great room and overall stay.
Just got back from County Fair. What a treat, The concierge was fantastic and the location is really second to none for a tourist.
Try to get a room on the Thames and just pretend you are observing history in the making.
Enjoy, and share your experience with others.