Let's Take a Seat is not a typical Thai restaurant, if you couldn't already tell by the name. If you are looking for super authentic Thai cuisine, I would say perhaps go somewhere else. But if you want to introduce someone less adventurous to Thai flavors, this is the place to go. You, the adventurous eater, will not be bored as they have a few fusion dishes that sound interesting.
A friend and I went there for lunch and ordered off the lunch menu. Bonus points for having a lunch menu with smaller portions and lower prices. I ordered the red curry chicken which was rich and tasty, a little too sweet for my personal taste, but still good. The service was good but it took a little too long to get our change, not usually an issue but time is a factor when on one's lunch hour.
I would go back to LTAS for dinner and try one of their specialty or fusion dishes. Also, their dessert menu is not traditional Thai, but looks very tempting.