Other than the ST+ benefits already mentioned, I can say without exception that on every flight that I have flown on CI/CZ/KE/MU and VN that the Purser has personally made a point of coming to my seat and thanking me for my status, and to be sure to let her/him know if I want anything/anytime during the flight. I always appreciate the acknowledgment as these Asian FAs are much more attentive and polite, in most cases, to the customers on their flights. Maybe as I'm always flying in Business Class, that helps!