Disclaimer: this review is solely based on their taro chiller w/ mini tapioca. Based on other reviews, it seems that their green/ black milk teas are mediocre.
Bubble Republic has discounts on certain drinks depending on the day of the week. Since it was Tuesday, I got the large taro chiller w/ mini tapioca at 50% sugar. The taste of taro wasn't strong, but I liked how the texture resembled a thick smoothie. It wasn't overly sweet either, and the tapioca pearls (which were suitably slightly chewy) complimented the drink well.
However, in terms of other drinks, it might be better to go when there's a discount.