It was a very smooth process. I had my interview at the old location in Taipei, went through security check, waited for them to call my number. The first lady went through all the documentations that I brought and ask a few questions. The second person just ask few questions about my wife's family and how many times I visited the States. That was it. I think I waited 30 min (I got there early) and the whole process took 20 min or less.