After a few visits to Siri Thai I can give a very solid 4 if not 4.5 stars to this albeit small but well run Thai restaurant in Las Vegas.
First let me point out there are at least 1000 Thai or Thai/Chinese style restaurants in Vegas and most are about average. There are some standouts and I would define them based on quality of menu selections and authenticity. If they serve deep fried shrimp or egg rolls or any of those other pseudo Chinese dishes I don't consider them a "Thai" restaurant.
Siri Thai started off as an offshoot of the popular Thai/Chinese restaurant "King and I" on Maryland which built a location in Summerlin as well.
The relationship only lasted about a year due to the exact type of differences on menu that I outline above. King and I is very Thai/Chinese and Siri wanted to be more of a traditional Thai restaurant.
Enough history, now to get to the review.
With some great traditional dishes and specials Siri Thai has something for everyone who enjoys authentic Thai Cuisine. Their menu is a bit short but I feel this allows them to focus on quality.
Their ingredients are always prepared fresh and their service is very good.
The owners mother still works in the kitchen overseeing the quality of the dishes and you can be assured your meal will hit the table hot and prepared with care.
If you like Thai its worth the trip up Eastern to check out Siri Thai.
On a side note.
Unlike some establishments that question Americans seeking spicy food Siri will make the food as spicy as you'd like. Believe it or not there are times when restaurants refuse to spice the dish as you request opting rather to bring it on the side and let you add it yourself. I think this relieves them from liability and the option of you sending the dish back to the kitchen.
Lotus of Siam also will make the meal as you request which is another trade mark of an authentic Thai restaurant.