This place makes great burgers! The buns could use some help but all in all for the burger alone it is worth it. Ask them about their 'off-menu' items...not only is the place paying homage to In-N-Out (which I have yet to go to) they also have a bunch of 'off menu' items a la In-N-Out.
Living in North York it is a long ways away for me to go there but I see this being a Toronto institution for a long time to come.
Note: The venue is SMALL. They have a small counter with a couple of stools but most people do not eat in the establishment - there simply isn't room to hold more than 3 or 4 people eating at once.