I went to the office at Dec 28. After filled the urgent processing form, I went back at 1:00 as they asked. And then waited until 2:30 to be called when they finish all the scheduled pick up applicants. When I finally in the lobby,there are 40 people in front of me to be severed. So I wait one more hour, when I finally be called, I went to the window, the woman just said I need check something. Then, it is another half an hour waiting....Then I asked her, she just said if I didn't get an email from the consulate then my visa is not ready. So I withdraw it...
The office in NY seems to have no right to decide whether or not you are passed. So I think the only effect of walk in is to push them a little bit harder....Good luck to all !