I literally couldn't say enough good things about Tien Wong. It succeeds in almost every way except possibly locale. But it also represents a successful culmination of all of Johnny's previous efforts.
The food is a score- its almost impossible to make this meal unhealthy, and yet, it is packed with flavor. You could tailor this meal to fit almost any palate, from the adventurous to the timid tongue. My experiences over 2 visits remind me much of the experience will depend on who you attend with. I found the range of ingredients to add to be phenomenal, including housemade tofu, a range of asian greens, and a huge variety of meats. I'm a tough critic of seafood in the desert, but the mussels, on both visits, were top notch. The fish balls were equally good. Definites on any trip should include enoki mushrooms, quail eggs, almost any of the beef (though we loved the black pork, too) and the tofu. having tried the Yin Yang, we were disappointed in the blandness of the yin vs the ridiculousness of the yang hotness... much of the meal was spent trying to blend the two to the right proportions. I preferred the lemongrass, and would love to try the curry or miso. Frankly, I'd love them to trust us enough to use the split pot on any two broths we like (not an option- they're scared guests would mix two broths that wouldn't work together, so they control the experience this way).
Be forewarned, any of the spicy soups just get spicier as time goes on.... Really hope that Johnny focuses on these small, authentic spots, rather than expansion, crazy upscale spots, etc.