We visited for Valentine's Day lunch after having (a) visited Hong Kong in January and enjoyed the Yum Cha trolley service (b) read the great reviews on here.
First things first - we arrived early for lunch (1145am) which is well worth doing - as the huge dining room was completely full by 1230.
The 5th floor room is a huge size (maybe 500 covers?) and traditionally decorated (including huge chandeliers) creating a great buzz throughout the restaurant and the trolley service is very efficient - trolleys constantly bringing new delicious dishes.
Second TOP TIP here is be patient - the trolleys come round constantly and if you fill up too early something else delicious may come out later.
We enjoyed prawn dumplings (traditional steamed hau gar and also a wonton style served on a plate with dipping sauce), roast BBQ pork meat, fabulous noodles, and a huge huge plate of deep fried squid. This was all as good dim sum as we have ever tasted anywhere in the world.
The only dish that detracted from 5* review was the gai lag - which was cooked in front of us - although was very oily when it arrived - was it braised in oil.
That said service was good and efficient - although as often with dim sum not as warm as it could be - and all in all good value for money at $60 for lunch including delicious jasmine tea.
We'll be back, would recommend - so do come early and be patient!