On the 90th day, I make an appointment. The earliest day on infopass is 5 days later on Friday, so I make that appointment, and print out the sheet confirmation with the barcode.
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On Friday
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I went to the line at 10:00am for my 10:30 appointment. The guy at the door says you can't come in yet, come back 15 minutes later. That means even if you come really early before your appointment it is pointless. It is best to come 15 min before.
Yesterday myself and my wife oath was completed. I had my interview on 18 Sept @ 2:30 but I didn't received the oath letter since it was too late. My wife got a call from Atlanta USCIS this Monday and was called for the oath ceremony on Wednesday. My wife requested them to have oath with me. USCIA call us again on Wednesday morning and scheduled oath for both of us on Thursday @ 1:30 PM. I never received the oath letter in mail.