This is one of our default Thai places. The prices are reasonable and the food is great. Atmosphere is clean and wait staff is nice.
The pad thai is pretty solid - they make it pretty perfect in my opinion (well, most of the time - it was a little off a couple times during the lunch special). If you want noodles and not pad thai, try the pad see ewe, they make it good too!
One of our fav dishes is the pad ka pow chicken (basil ground chicken). We also sometimes get the yellow or red chicken curry. The sauce is not as thick as I'd like it to be, but it's still super flavorful. I wish they would give a tad more rice, but the portions are still a great size. On their scale of hotness, we always get 5 - its just enough heat for us (although I've heard its too spicy for some people).
I definitely recommend Archi's. I can't speak for other locations, but the one on Rainbow is awesome and we keep coming back.