I have been eating at Pin Kaow for at least 8 years. I think it's the best Thai food in the city. I have only eaten at the original location on Lake Mead and Rainbow so I don't know how the other locations are, but this one is great. People have told me that they prefer Archie's, but I thought it was terrible. Pin Kaow is pretty consistent and with all of the remodeling the decor is nice. I use Pin Kaow as a standard to compare all other Thai places to, and I have never found one that I like as much, not even in other cities.
I recommend the shrimp rolls, Tom Ka Koong soup, and the Pad Woon Sen. Oh, and of course the Thai tea.