Just had my interview at JFK airport today. After submitting my application I was conditionally approved in a day. The final approval was in my mail when I got back to the office today so it was less than the 2 hours to drive back. Took less than 10 minutes at the interview and only asked for my address. Only needed my passport, no other id.
They were taking walk ins but after the people with appointments. When I went there were quite a lot of people in the waiting area and I was called before most of them. I had an appointment but I guess the others did not.