This is the best location in the GTA (relatively speaking). This one is a bit out of my way but I prefer coming here than the other Woodbine or the Markham Rd Costcos.
This one is more spacious; parking is less of a nightmare; and things are more well stocked here. Staff here also seem more friendly. Optical center and photo lab, and the butcher are all helpful.
It does get crazy here on weekends, especially in the afternoons. I usually go on weeknights or really early in the morning on weekends.
I like the garden center here, especially at the start of the spring when they have lots of selections