They have a grilled falafel in pita there that is my favourite falafel in all of Montreal!
They also have a similarly grilled sandwich filled with spinach called sabaneg or something like that. It's pretty good as well if you're a vegetarian.
The grilled falafel sandwich itself is unusual in that the falafel balls are flat and wet - but it rocks so hard that it's my fave in the city. (And I'm a self-confessed falafel freak).
It's a pretty popular place for both meat eaters and vegetarians like me so expect to wait in line if you go on the weekend. It's also fairly noisy. Ambience is casual and the place has a warmish feel with interesting art on the walls. I've been going there for about 12 years. It's also juuuuuust across the street from Fromagerie Hamel - a fine Montreal cheese shop.