Interview went very well, friendly staff. My fiance made a mistake on one of the questions on the I-129F, and answer one of the questions wrong but i had brought copies of extra documents he sent indicated that he must have misunderstood the question and after presenting the evidence, the interviewer could see it was an honest mistake. (So I suggest bring everything you have, you never know what you may be able to show in case there is an misunderstanding about one of the questions).