I was back and forth between BOS adn LHR a number of times over the last few months and always used the CX First Lounge only. Two weeks ago when I was there I visited the FL and it is no comparison, the CX lounge is far nicer and newer. I also had the opportunity to visit the ORD FL for the first time in the evening on the way back adn I was quite impressed. Perhaps it was because I was less than impressed with the LHR FL, but I did quite enjoy the ORD FL - especially teh chocolate covered strawberries.