LoS is overrated. Quality maintenance is harder than quality attainment. I don't think it's so much that the staff is lazy or disinterested. It's just that it's hard to stay motivated to cook aggressively and ambitiously when the clientele isn't aggressive or ambitious in its ordering and dietary habits. This fault isn't particular to ethnic restaurants: most high-end restaurants succumb to the same pattern of early greatness followed by plateau and then slow, steady decline (if they ever reach the heights to begin with).
To be fair, the food was very good. It was not extraordinary or even top 10%. Fresh mushroom salad was an interesting idea, half-realized. The two shrimp that accompanied the salad were fine, but not of the same quality as at a much more unprepossessing restaurant I visited two nights later. The salad itself was a bit monochromatic.
I did enjoy a dry beef liver entree, though it was not nearly as spicy as my server averred. He helpfully provided some condiments and recommendations.
My server, in fact, helped me to my conclusion that LoS wasn't terrific. I'd gone to LoS expecting that it would be overrated. But I don't like to prejudge. My server was more enthusiastic in recommending other Thai restaurants than he was in talking about his own menu. I do not mean that he was unprofessional or that he spoke negatively about his employer. It was just clear by his demeanor that he prefers to eat elsewhere.