After two trips to Thailand I can honestly say - this place is pretty authentic. (Well, as authentic as you can get without access to the incredible produce markets in that country.)
Here are the things that leave me with a pang of ache, missing Thailand:
1. The peanuts with scallions served to every table
2. The decor - it's pretty right-on
3. The red pumpkin curry
4. Anything with pickled lime leaves
It's a great date place, and a great family place.