My experience in columbus, ohio
My timeline:
eb3, priority date June 2002
RFE on 485 for self March 2005, spouse a couple of weeks later.
Replied to RFE beginning of May. Received notice on June 8 that our case was transferred to Cincinnati, Ohio
Made infopass appointment to visit Columbus and was told that Cincinnati was the office that received files from the service center and that Cincinnati would forward the files to Columbus.
I have known Mr. Khanna and his team for over 15 years now, and have exclusively used their services any time there has been an immigration related need personally or for my organization. They just have a knack for getting things done and I will unequivocally recommend their services to anyone.