I came at an off peak time (few days after grand opening) and there's still a considerable wait. 10min to place the order and was told to return in 20min for the drink (glad they gave me a heads up about that). I don't like to waste time waiting so probably won't be back any time soon (at least till the crowd does down and the staff get quicker).
Got the taro milk tea (30% sweetness). It was not sweet at all, and tasted weird actually. I thought it was slightly powdery, although my wife who also tasted it didn't agree (she did also think that it was weird though). The funny thing was that the drink she got (mango juice) was also 30% sugar, but was really sweet.
*** The grand opening special (until 4/9) is a free regular drink (one of 3 options) with the purchase of another drink. ***