Soi 4 is a highly polished Americanized Thai restaurant that sports nice ambiance and offers up some very nice presentations but is not very authentic and by no means out of the ordinary. They have an original location on the Rockridge district of Oakland where inside to live and that place was somewhat better actually.
I lived in Bangkok for a long time. Soi 4 has some of the polish of the newer more upscale Thai restaurants in Bangkok but offers little of the authenticity. Tom Yum very weak. And they cook without fresh Thai chili peppers? Really? Dissapointed. To be clear, not bad food, just not the real deal I was hoping for.