I can't say I experienced nearly the busy-ness that other reviewers on here have, but this place isn't worth any sort of wait because the product simply isn't good. Despite the Canadian fame, I found the doughnuts here reminded me more of cheap grocery store pastries than anything else, and I honestly ended up choking them down. There was no cold coffee, and the closest equivalent - some sort of milkshake thing - was so sweet it basically wrecked my teeth.
I'd strongly recommend simply going somewhere else in the airport.