I've been here few times and I recommend this place to those who want to try different flavours of bubble tea.... Their specialty bubble tea includes; pudding bubble tea, Hokkaido milk tea, oreo milk tea... but they still have regular bubble tea flavours. Like everyone else mentioned, they give you free popcorn to eat!
Green Grotto is not big as Go For Tea or Destiny but it has a cozy atmosphere and the servers are A LOT NICER than the servers at other bubble tea places. The place also have free WiFi and tons of magazines to read.