I had my interview back in November, at the Buffalo (NY) DO. It was so quick we were in and out of the office within 10- 15 mins. We had a very nice woman officer.
She asked us to swear the oath, she asked us 3 questions and wanted to see our utility bills.
Once she had photocopied them, she came back in the room and said my GC had been approved. She said i should recieve it within 2 weeks, which i did.
Hope everyone's GC interview could be so quick and easy.