We had two appointments. Mine was at 9.30 and my daughter's at 10.00. Due to traffic we were late and got there at 10 am. When we checked in we were asked why we were late and my hubby told them how ridiculous the traffic was. We sat down and waited what seemed like 30 mins or so (I didn't have my cell phone or watch on my person so I'm guesstimating) before my name was called. The buzzer we had didn't actually buzz. Our IO was professional and polite, not overly friendly but we didn't feel uncomfortable at all. She was with another lady whom I would assume was a trainee officer but I'm not quite sure. We were asked for the usual ids, I-94s and bonafides; Quite a few questions from the I-485; how we met and that was basically it. She went through my file then my daughter's and then said someone else would review the file. We were not given verbal approval and she didn't take my EAD. She didn't even realise that my hubby is not my daughter's biological dad but then again nobody ever realises since he's the only father she's ever known lol. Anyways, I would say that once you truly have a bona fide marriage there is nothing to worry about.
We got emails later that day informing us about card production and one week later our cards arrived in the mail.