We've eaten at several Thai restaurants in Salt Lake City, including the highly rated ones, and were delighted to discover Thai Siam. It's just a step above all the others.
Parking a bit quirky, use the small lot on the north side of the restaurant. Seating, hard wood chairs. Take a cushion if you need one. It was beginning to get noisy when we left at 7:15, so keep that in mind.
BUT, the food and the service were just wonderful. Server Jon Ray couldn't have done a better job. And the food, well, yumm again. We had two different soups and two different entrees and they were all super. The servings are large, so we'd probably split a "cup" of soup and an entrée in the future. Spice levels were just as we requested.
If you love good Thai, this is the place.