Ask for the special menu. And get something seasonal that the chef recommends. Not to say the regular menu is a slouch. But, to find out why this place is just a bit better than most Thai places, you need to expand your horizons. I'd definitely go with a fish dish, maybe something spicey, and break out of your comfort zone and order something you've never had.
The expansion hasn't done a thing for the food. The bar is a tad pricey, and the seating can get downright funky. And you need to go on a relatively non-busy day to escape the crowds.
So, go here for some authentic Thai dishes that are extraordinary. Don't go if you're not willing to be adventurous and only want another order of Pad Thai.