Thoroughly pleasant experience. Security, checking in took only a few minutes. My interviewer was running a little late (~20 minutes), so we rushed through everything. Started with the 6 civic questions and the read-write test, then quickly going through the details of my application. She didn't want to see any original documents (or any documents at all). We chit-chatted for a minute about the vacation I just returned from, and I was out of her office in 7 minutes. Quick and painless. Love the Portland USCIS office. Everybody is just really nice there (also for the biometrics).