I'm not sure what happened that previous reviewers have spent fortunes on their meals here, but I went as a group of 3 today, and our bill came to $16 each. We had 7 dishes (our favourites being the steamed pork buns and the egg tarts), and I don't think that this was an exorbitant price at all.
Definitely go, and make reservations! This place is parent-friendly, baby-friendly, and even date-friendly. Don't worry about the Yorkville address; while some customers are wearing pearls and dresses, most are wearing smart-casual attire.
My advice would be to the serving staff: a brush-up on manners would be nice, though I can understand that the harried nature of a busy restaurant would affect the servers' patience.