By far my favorite Thai in Charlotte.... anywhere for that matter. The five stars are for the food and charm of the owner. She is a nice lady and always takes time to chat you up. Nights and weekends are relatively slow in the dining room, expected based on the location (Corporate Park) but lunch time is always busy.
I am a fairly frequent customer usually stopping by once or twice a week and worth the drive (15 miles). Thom Kha soup, Red Curry, Noodle Soup, Pad Thai... all of them are consistently delicious.
Overall - If you like Thai food, you need to give Siam Garden a try. Do not let the empty dining room during the evening and weekend hours spook you away - The food is very good.