This place always have super long lines but they move fairly quickly. I would say their prices are slightly lower than other by chains and their selection is pretty decent.
When it was our turn, we ordered a lemon yakult and a wintermelon tea with grass jelly. The wintermelon tea with grass jelly could only be made with regular sugar. We ordered the yakult with 50% sugar and regular ice. Suddenly, the cashier cleared the order and decided to reenter. He entered lemon yakult with regular sugar and 50% ice. He completely forgot our order within seconds. We had to remind him that it's the other way around.
The lemon yakult was pretty good. It's basically a yogurt drink with a sour lemon taste.
The wintermelon tea with grass jelly was extremely sweet. It was like drinking syrup. Not too sure why they couldn't make it less sweet as they could simply add some water...
Overall, I would come back as their other drinks are not bad for the price.