Pretty big.
A little less cramped than some other flea markets in Toronto.
Quality and selection is average at best. Lots of shops sell the same stuff - clothing, accessories, etc.
They have a small coin collector booth - Prospector's Cards and Coins. Mostly Canadian stuff from what I could tell. I picked up a few things for about $5.
There's a food court, a farmers market, a small arcade, and an entire section dedicated to antiques.
Washrooms were surprisingly clean.