I went here a few winters ago with my two sisters for brunch on a Saturday. I did not expect the wait to be two hours. We were super hungry and freezing from waiting outside in the line.
When we got in, our endurance paid off, and we were greeted with giant plates of eggs benedict, various fruits, potatoes, salad, and hot coffee. The portion sizes were huge and we finished everything in minutes as we were starving. They have a good variety of breakfasts, both sweet and salty.
And as always with brunch in Montreal... go early.