I don't know about authenticity, Im Asian but not Thai, and I found Salad king tastes better and cheaper, cuz for the same price the portion size here is about 2/3 or 1/2 of what salad king offers. Decor is a bit shaky. The stir fried glass noodle tasted good, but Pad thai was awful, and for both, the shrimps inside was so bad........ waitress/owner was really impatient.... they have 10% student discount tho.