This place is the core of Downtown Montréal. Whoever came to Montréal, they definitely will visit this place for their shopping. Also this place will be crowd at the Boxing Day for 110% sure.
But if you take your time to visit this place. You will find out that most stores are similar and their price too. So its not a big deal to take hours to compare one store to another.
The underground tunnel connected with many places with lot of restaurants. This is the reason I come to Eaton during the winter time. You don't have to walk outside for shopping and looking for food to eat.
This place offer also free wifi. So it's good to hangout with friends.