There is a reason why they have been around for so long. No matter how busy they get, their service doesn't get discounted. I think that's why they usually have at least a quarter of the patrons who are regulars.
I don't feel like they use MSG, but they somehow manage to grind out REALLY tasty food as fast as fast-food restaurants....if not faster...my wife and I have yet to order anything from here's that we don't like.