This is literally the only choice if you are stuck in the "dungeon," as others have dubbed it below, flying to the U.S. from the Toronto airport.
It's pricey but the food is good - I had a chicken pesto panini ($8.99 CAD) and a bottle of water ($2.99 CAD). There's also limited seating area - maybe 2-3 tables (with two chairs each) and a small bar area, which looked to be fully stocked with liquors and wines.
Service was fast and friendly and I had no issues with that either.