I come here very often, probably once a week. Depending on who's working, the service can pretty good or needs improvement.
I always order grass jelly milk tea with less ice and sugar and 40% of the time the cashier would punch in roasted milk tea while the other 60% of the time, the cashier would clarify if I wanted regular milk tea or roasted milk tea. While I don't mind the taste of roasted milk tea, I would much prefer the regular milk tea instead.
Lineups vary depending on the time. It tends to get busy later in the day but once your order is placed, the drinks are made pretty quick.