People there were really nice and the interview was a breeze. They asked questions about our work, what we make per year, how we met and when we were getting married and if we had some evidence of relationship and I showed them what I had gathered since submitting the I-129. The entire process took about 2 hours, most of it just sitting and waiting. They took fingerprints there as well. Best thing... have your forms organized and exactly what they ask for.