In a nutshell: uneven food, uneven service.
We got there Saturday night, a few minutes after 7, and they were full. We had a party of six and were given an estimated wait of 20 minutes, but fortunately for us, a reservation for a party of six cancelled and we got their table. And then we sat with menus but no water, for what my friend claimed was 15 minutes. Fortunately when the (very nice) server showed up she took both our drink and food orders, but we didn't get any water until halfway through our meal (at one point an older gentleman approached our table, water pitcher in hand, then realized we didn't have any glasses to refill, and eventually he reappeared with a tray of filled glasses). At an adjoining table, one couple walked out when they'd also waited 15 minutes with no water or service. Later in the meal, half the table got their entrees and half didn't (always awkward). On the other hand, when we did get the attention of someone, the service was friendly, and our waitress handled requests for additional rounds of drinks, separate checks, etc. with aplomb. The restaurant cleared out while we were eating (Half Moon Bay rolls up the sidewalks early, even on Saturday), which may have helped somewhat.
I hadn't been there in many years, and I'd always liked the food (although sitting there I remembered another occasion with service -- or rather, no service -- problems). Fortunately, everyone liked their food. In particular, I thought the Tom Kha was a good version, with a nice kick of lemongrass to balance the coconut milk. None of the food was particularly spicy, but the flavors were fresh and well-balanced, and I think I probably could have gotten it spicier if I had asked. The one really odd thing was the salad one of my friends ordered that was sort of a Thai take on chef's salad that was carefully topped with four Pringles potato chips! Portions were generous. With drinks (multiple beers, Thai iced teas), tax and tip it came to a little over $25/person.
Basically, not destination Thai food, but certainly good enough for a group of hungry people after a day of hiking, beachcombing and tidepooling. Just go after 7:30.
20 Stone Pine Rd, Half Moon Bay, CA 94019