It went well. Naturally, I was a little nervous first. After the test, they switched to questions on my life. As long as you give truthful answers, you will be fine. Some of the questions were strictly factual (e.g., your occupation now, your occupation prior to moving to the States, which country you visited in a certain year etc..), while others were of sort of evaluative nature, when you had to either clarify something (e.g., reasons of why some event happened in your life), or explain in your own words how you understand a certain term related to immigration. They definitely have all the factual info on you on their computer screen in front of them and just comparing your answers to their info. As far as I understood, they ask clarifying questions when they need to understand the nature of your motivation behind certain events in your life. There was also a series of "yes or no" questions (same type as in the N-400 form: e.g., have you ever been a member of a communist party?). The interview goes pretty fast.