WBB may no longer be the world's "biggest" bookstore (that award goes to Barnes & Nobe in New York) but it still holds the title of largest number of books under one roof, worldwide. There is an absolute shit ton of books on its two floors, but thankfully it's hard to get lost cause the shelves are low.
Don't expect any fanfare from the staff though - they're too busy emptying skids of the latest Twilight novel or whatever newest fad book series has just come out. I kinda like it that way though - it allows me to browse in absolute peace.
Which brings me to two more things worth mentioning:
(1) The magazine section is THE NUTS. They probably stock about 500 different magazines here. I swear it's ten aisles of magazines. The music mag section is colossal and full of the best glossies that a regular Chapters doesn't always stock - I can always find my coveted Under The Radar here and back in the day they carried Comes With A Smile, which is a super rare magazine. I could spend hours reading magazines here.
(2) The bathrooms are private and unattended. A good option if you're downtown and need to empty your wizzer without any fuss.