They rival NYC's famous Katz Deli. I sat on the counter with a friend and we ordered their smoked meat sandwich on rye, and shared fries and a pickle. The meat is tender, moist, and extremely flavorful. Their smoked meat is like this review: simple, no frills, and no fuss. I liked it and I'm sure you will, too. Since I'm not a local, I said I would visit Schwartz's at least once when visiting Montreal. It's like a NYC tourist visiting Katz' deli at least once on their visit: why not. When on vacation, I don't usually remember the price of my meals because living in NYC, most things are pretty expensive already (Katz' sandwich is $15-$17 for one! Geez).
There was a line out the door. The interior is busy (not cozy), but counter staff is friendly.