When people mentioned about the greatness of Montreal's smoked meat, they are really referring to Schwartz's. The others might attempt to imitate but they failed miserably.The place might be small, dirty, crowded, and you have to wait in line most of the time, but it's all worth it.
Order your smoked meat lean, medium or fatty and they are equally delicious. I always ask the server to order enough meat for our group and they'll know what to do. Take a few pieces of meat and put them in between the rye breads. Add a little mustard and voila - the best dinner in Montreal. It goes well with cherry coke too.
Note that you might have to share tables because they don't have a lot of spaces. Apparently the owner refuses to move to a bigger place. If you are in Montreal, you must try Schwartz's!