There's nothing special here. I went out of my way to check it out based on the reviews I read on this site, and was disappointed to find a Thai resturant thats mediocre at best. It may be more authentic then some, but for the most part it fits into the standard Thai resturant mold thats geared for westerners.
The menu is also very slim compared to other Thai resturants in this area. There were a few items I was suprised not to see. I did try the Phad Thai based on someones positive remarks, which was pretty good.
But mainly, I found the service to very unfriendly and rather rude, especially since I was the only one there. I let him know with a short tip, which is something I rarely do.
All and all, there are better places to go eat good Thai in Seattle then Chada Thai.