Montreal has a lot of good pastry shops, and to me, this one is the best. Their desserts are excellent, and they also do a killer brunch on weekends only. I think maybe only Sundays? Can't remember. At any rate, if you are in the area, you should try it.
They take reservations for their first seating (around 10 AM?), so if you don't want to wait, call ahead, because they are pretty small.