When I'm in the West Island and have a few minutes to spare or I'm looking for a book, I will drop by here which would generally be on a weekend or on a day that I don't have to work (since there is a large Indigo bookstore near where I work). This Chapters is located in a parking mall and is quite large.
Along with selling books and magazines, they sell some electronic items including iPod Touches, iPads, Fitbits, fitness trackers, and Kobo eReaders.
There is free WiFi but you must either be a Bell Mobile customer or you must be a member of their Plum Rewards (free) program or their iRewards (paid) program. If you are a Bell Mobile customer, you enter your phone number and you get an SMS with the code/instructions to log into their WiFi so unless you have an SMS plan with Bell, you will be dinged for the incoming SMS.
There are some chairs scattered around the store where patrons can sit and look through the books before deciding whether they want to purchase it or not. Upstairs, there is also a Starbucks coffee shop with tables & chairs. I'm not sure if you're allowed to take your books/magazines into this area (which you haven't purchased yet) but I just wouldn't feel comfortable doing this.
I've always found the staff to be very helpful here.