My absolute all time favorite place for all you can eat sushi in Montreal. They always have amazing, fresh, delicious food. Their sashimi is to DIE FOR (I know... how hard is it to screw up raw fish?!)
You can always depend on this place whether you have a reservation or not. They don't have a max limit of one dessert per person which is really an upside (too many cheap all you can eat places in montreal). They bring food out in a timely manner, and have a good ratio of fish to rice.
Everything is fresh and you definitely get what you pay for. I always recommend this place to both friends and family. Heads up; they only accept cash and credit cards, no debit!
Must tries here: Salmon Sashimi, beef tataki (beautifully grilled on the outside), the dragon eye roll, and the fish cakes.