I am in the downtown core frequently, and I love going here for lunch! The food is delicious, the service is lightning quick and the servers and extremely friendly.
The only thing I would change, while they are efficient, is the slight lack of organization when picking up your order. Currently, you remember your order by it's number on the menu. If 10 people have # 41 you have 10 people wondering who's #41 is next? It would be much quicker and less confusing if the cashier assigned you a number and that number was called as your order came up.
But, as far as beefs go, that's all I got. Otherwise I would eat there every day if I could!