Don't always believe the hype when it comes to Montreal.
This place is only a 'souvenir'. Today it's a inexplicably expensive regular fast food restaurant.
The orange juice they serve is a home recipe, made with water, pressed orange juice and sugar added. $5 for a relatively small cup. It is not pure pressed orange juice, which would sell for the same price elsewhere in Montreal.
The Poutine is no longer anything special, save for the price - $7 for a small size.
As you can figure up, it will quickly add up to $15/person if not more.
Basically, there is a La Belle Province just across the street, as well as a Harvey's just in sight. Cross the road and you will find proper seating and same food quality - or better - at a regular fast food restaurant.