Yes, this place is pretentious, yes, the reception staff are incredibly haughty but the service is actually very good once you are in , and the seating and surroundings very nice and it really has amazing views of Hong Kong right in the middle of the central district.
They do not take reservations for their 3pm high tea and you have to queue, but not a minute before 2:15pm! Perhaps this being HK, people actually accept this and there is an orderly queue for 45 minutes before they lead you to comfy seats inside the restaurant or outside on the terrace. Service staff are very courteous once you get past these hoity-toity girls at reception, but actually it's no worse than any trendy places anywhere in the world.
Once you are in your comfy seats, service is prompt and friendly and once does not feel rushed.
Now the actual food is really yummy. There is a good selection of savoury pieces as well as cake. Staff will come and refill your tea.
IMHO this is better than the Mandarin high tea ( unless you want scones and rosepetal jam -no other place does it better than the Mandarin). Otherwise Mandarin sandwiches and cakes are insipid in comparison. The Peninsula high tea is held in an echo-y foyer area and the food equally bland. The Four Seasons lounge high tea is pretty good, and they will go round with more cakes in addition to the platter one orders, but the seating area is cramped and noisy.
In summary, I go to high tea for the savouries and cakes and if the ambiance is good that's a bonus. Sevva beats everyone in town just now for the actual (high tea) food so I would be prepared to put up with the altitude which sadly is quite common for a lot of establishments in town these days.