This place is consistently great. I've been here for lunch and dinner and enjoyed it every time.
For lunch, I definitely recommend ordering off the lunch section on the back of the menu. Food is great and the price is a good deal.
For dinner, I recommend starting out with the Tom Yum soup. Noodles are fantastic, as are the curries, and the fried rice is delicious. The only disappointing thing I've had was the shrimp roll appetizer. It was whole shrimp wrapped in rice paper and deep fried, which was not at all what I was expecting.
One thing to note is Archi's has a few restaurants around town and the numeric scale they use to tell how spicy you want a dish is not consistent. A 4/10 at one location is more like an 8/10 at another.