For starters I should say that I travel all around the US and make an effort to eat Thai food in every city I visit and Siam Orchid is by far the best, best, best Thai restaurant I've been too.
It's not glam or glitz, it's more like if you had a Thai aunt that could run into the kitchen and cook you up some that tastes amazing. The staff (a family owned business) is incredibly friendly and personable. I've never seen more customers come in and get hugs. Ask a couple of questions about Thailand and you'll be the next hug recipient when you come in.
The food, off the charts good. It isn't often that you take a bite of something and wonder how they manage to make it taste so good. Recipes, as described above, are a family secret that the owner Pimpom isn't sharing with anyone.
So if you're in the greater Phoenix area and looking for a Thai place I would recommend that you look no further, pop in and give Siam Orchid a try and you won't be disappointed.
Lastly, the review below is a shockingly different story from any experience I have had .. and I've eaten there more than 50 times.