I've been a fan of Chatime since their 1st Toronto location opened, but I stopped going because of the perpetual line up and lack of seating at the Bay/Dundas location. This location, as others have already mentioned, is much quieter and more relaxing. I can always get a table and it's never that crowded, so you can feel free to stay and chat with friends or read/study.
My go to is the Caramel Milk Tea with tapioca - so good!! Quality of the tea and tapioca has been consistently good, and I find the service to be efficient and friendly. You can adjust the amount of ice and sweetness in your drink. As it warms up, their seating increases as they have a pretty big patio facing out to Bloor St.