Professional and efficient. Wife was asked some questions, not too much. Early in the interview, it was pointed out that a page of the notarized Chinese wedding certificate was missing a page! DISASTER!!!
Wife was so flustered for the rest of the interview, that she even forgot to show the officer our nice photo album
Officer was a woman around 30, professional and had a good poker face. Wife honestly did not know if she was going to be approved or rejected. Left with a 221g to send in a new marriage cert with all pages. We sent it in 10 days later, checked the status on CEAC obsessively, and 3 weeks later it was issued. Happy ending.