RFE was mainly for confirming that I was not out of status from my very first day in US. Had to show W-2s and other proofs (like salary stub and employment letters) to show that I was in status. Apart from that other
documents like current employment letter, latest pay stub etc was also asked.
Interview was quick and easy. The officer looked at my RFE and went throu my papers and asked me how can they be sure was I maintained status till now. But then the officer looked at the documents I sent to INS as my RFE response, and was convinced. She also asked my EAD, Parole, Passport, I-94 and Drivers License. All together it took about 15 min (for me & my wife combined). Although I had changed my job once using AC21, all she asked on that was whether the current job was the same/simialr to the old one. Then she asked some security questions, took our finger prints, stamped our passport & told us the card would come to you in 4-5 weeks.
-- rbls5