A decent sized store for a downtown location. They used to be located just up the street a bit where you had to take an escalator upstairs. Now they are right at the Yonge/Dundas Square intersection and yes you have to take an escalator upstairs.
It is a decent sized store but much smaller than your typical ground floor type big box you'd see in the burbs. If you were going to buy a big TV or something I have no idea where you would park etc.
For a big box in the middle of the core it still has a decent footprint and a lot of stuff on display like most Future Shop stores. They do have public restrooms way in the back by the home theatre/tv displays.
I bought speakers here last year (small ones) and they have a lot of console games etc so they are always good for that.