I recently attended an event here (Math Trade event with the Toronto Board Gamers meetup group). This was my 2nd visit to 401 Games. There is a lot of space upstairs for playing games, I think about 40 tables! The library of games (from which to borrow from) is quite extensive and covers a lot of the usual favourites and popular new releases. All the staff here are very knowledgeable in helping you pick out a game, and they're super friendly too.
The shop downstairs has a variety of geeky gaming items, from board games, to card games, to role playing games, to collectible card games like Magic The Gathering and Pokemon. The games are all sorted by Alphabetical order which really helps you to find what you're looking for. They carry some older titles that may be harder to find in other stores.
Lastly, there are plenty of options for lunch within walking distance, and a few right next door. Overall this makes 401 Games a great weekly hang out place. It's too bad I live in Woodbridge.