We have tried a few Thai restaurants around the East Valley and for my money Sian Orchid wins top prize.
I had a perfectly spiced Massaman curry and my wife had a Yello curry. Both were super tasty and we agreed that Siam Orchid had just become our 'goto' Thai restaurant.
The service was warm and friendly and the location just a little north of downtown Gilbert is excellent.
Can't wait to go back!