I came by here for a quick bite with my daughter as she felt like a hot dog and we were at the Marche Jean Talon!
In most other North American cities they are littered with hot dog carts all over the downtown area! Alas Montreal has strict food cart laws and so hot dog carts are not to be found. Hence William J Walter serves up a mean dog for a bit more than hot dog cart pricing. I ordered up the Jalapeño "all dressed" (sauerkraut, olives, ketchup, mustard) and my daughter just had a mild dog with ketchup.
The quality of WJW is quite good, I just believe it to be a bit more than a hot dog should go for. It does however fill you up and leave your tummy satisfied! They do have a very good selection (usually around 15 - 20) that would make any German beer loving dog maniac happy! These WJW's can be found all over Montreal. Come check one out! They serve you well!