Went here for dinner on a Wednesday night around 9pm. Place was fairly happening. I would suggest a reservation. Overall a good experience. I would go again to try different things.
Ambiance: typical hype vibe you would expect from Cosmo. People were dressed up as well as casual. There appeared to be an area for a big group if you need one.
Service: really good. Server came right out and explained the menu. Even gave me some sample sake to try out. Her recommendations were pretty good. Food. Some out in a timely fashion. Waters were refilled throughout.
Food: I was excited to try David Chang's food. The menu was pretty simple. The server mentioned that some of the items were not his classic things (i.e. Ramen) and he was trying to make it more "west coast". I felt that some of the items did not live up to the hype. We had the soft boiled egg. Not really a deviled egg and kinda salty with the salmon roe. Next we tried the scallop poke. It was interesting indeed. Kinda creamy/salty. I probably wouldn't get it again and prefer the more basic poke. The yellowtail sashimi was pretty good. Not fishy at all and very flavorful. We opted to try the cold chili noodle. This was one of the highlights. The amount of heat was just right. Tons of sausage. It was also a good portion. Great flavor. Finically, I had the pork bun. The pork was nice and fatty. Cooked perfectly. The bun was light and soft. Just the right amount of hoisin sauce. I would love to try the other buns. Overall, food was great but not outstanding. I would return to try some of the other items