Every time I go back to Montreal, I have to make a trip to Benelux. Geoffrey is a rockstar, and is usually plastered by the time I get there.
The beer is all great - special kudos to Cuda, but everything on the menu is fantastic. I don't think I've ever had a beer I didn't like. The Euro Dogs are pretty good, and make for great drunk food.
Go in the back, sit in the vault, and enjoy one of the best beer bars in Montreal.