After spending a year in Asia, I understand that Pei-Wei is not authentic. It boasts extremely americanized asian food. This is an awesome place if your getting take out or dining alone. I would avoid large groups.
Pei-Wei is what I call a Hybrid Restaurant.
You order as you walk in, and receive your drink from the cashier. You fill your beverage and have a seat. The waitress brings you your food. You will not get a paper cup. You will eat off of real plates with real utensils. If you need a refill, just ask! Staff is more than happy to help. It is very low maintenance and quick. The management team is superior, the are always available.