When I think of a bubble tea place in Montreal, I think of Nos Thes or Chatime. I would say that Nos Thes has amazing service and a great cantine style lounge to catch up with friends on a sunny afternoon. I love the bean bag chairs in the front of the store for a more lounge environment.
The bubble tea is made from real tea and they have quite an extensive collection. I do find the teas quite sweet so make sure to halve the amount of sugar. The bubbles are a good texture and left in syrup so they also bring good flavour.
The food is pretty average taiwanese. If you want authentic food, I would look elsewhere. Overall not too pricey but a good place to get a bite or bubble tea any time of the week.