I can't add too much to the discussion - everyone agrees. They are super fast and the food is good.
The lunch specials are a great deal - big portions and delicious taste at reasonable prices.
It may seem a little overwhelming at lunchtime with the multiple lines of people, but trust me, they move fast. Look at the list up high, choose your number, and order. Once you've ordered and paid, they'll give you another number and tell you to wait. The wait won't be long. If you are dining in, someone brings your food directly to your table, and if it's to go, you'll be served at the counter.
Fast, efficient and tasty. Recommend: pho, chicken curry.