I found out about this place when reading a 3 year-old NYTimes 36 Hours in Montreal article. It was near our hotel and gave it a shot. We arrived at 10am for Sunday brunch and were fortunate that the wait was modest (10min). When we left, the line was out the door.
First, the dining space is very cool. It is clean, airy, and has a loft like feel. They really did a good job in optimizing a slightly narrow and long space. My wife ordered the Brunch Sante and very much enjoyed it. I got the De L'Atlantique (basically salmon three ways). Overall, mine was pretty good although I didn't care for the salmon in the sweet potato cake. Also, I did not think the fruit and salad were fresh. Finally, in a city with awesome croissants, the one I had from here was easily the worst I've had. It was stale and uninspired.
Despite some misses with the food, I definitely would come back and would recommend it to others. The overall experience was very pleasant which was facilitated by the great staff and the vibrant atmosphere. Plus the free refills on brewed Illy Coffee that comes with the brunch orders (the main initial draw for me) were terrific.