Like a lot of other bbt places, I tend to order my drink with only 50% of the sugar because they tend to be too sweet, and Gong Cha is no exception.
I was there on Nov 20th, which was the last day of their grand opening buy one get one free special promo. I got the wintermelon milk foam and the royal milk tea with tapioca (numbers 1 and 4 on the featured menu) in regular size and the price was $4.7, which is on par with other bbt places. They also offers the Vicinity points reward where if you buy 10 drinks you can get 1 for free. Both drinks came up pretty good, the wintermelon one was regular sugar and it was definitely too sweet for me liking, though I am unsure if the wintermelon taste would be too light if the sugar content is lessened, and the royal milk tea was decent but not too special either.
I give points to the nice interior of the tea room, it's well renovated and offers plenty of seating where you can bring a laptop (they have all outlets) or a book and enjoy your visit here.