Finally tried Momofuko Noodle Bar as part of Winterlicious last night. I had the ramen and a pork belly bun, and both were fantastic. We were seated at the bar by the kitchen, which was fun, so we could watch the food being prepared.
Even though they were busy, they didn't rush us out, and let us linger while we chatted.
My only complaint is that they sent me to the bar upstairs to wait (I was 15 mins early for our reservation), where the wine was over priced.