We did go to the HH Hilton Club for evening drinks but decided to stay with the restaurant for breakfast. When the club manager found out that we had a 6:45AM United flight she arranged for breakfast to be served in our room - complete with bacon, ham, eggs etc. and all we need to do was give the breakfast certificate to the waiter!
The only negative about the HH Hilton Club was the snacks they served we rather dull and the same everyday - only one hot item.