Yayy it makes me so happy to be able to customize the sugar level in my drink! Wish it was possible to do that with everything on their menu (the Wow milks can't be adjusted), but there are enough great options with that available. You can also ask for little or no ice, and their toppings are pretty cool.
So far, I've tried the matcha red bean shake (awesome), matcha shake without red beans (not on the menu but they'll do it for you), taro green milk tea, and taro milk tea. All of them have been tasty! I usually get a double order of bubbles because I can't get enough of them. And yes, those are soaked in a syrup, so they have some sugar. I wouldn't recommend getting bubbles with the red bean drinks, because their textures contrast in a weird way. But do as you please!
I've never been to a single place this many times in one week...