I'm the petitioner, but I attended my fiance's interview in Montreal so I'll be providing the review for him.
The interview was scheduled for Wednesday, Feb 3rd at 9:30 AM. Crappy weather, so we were happy that they let us in when we showed up at 8:30 AM. We got number 19 and went through the usual security checkpoint and then headed to floor 19.
We sat in the middle section for probably about 45 mins - apparently we could have come earlier for our 9:30 AM, but we thought if we showed up too early we would get turned away.
The first kiosk was very brisk - "where's this doc, where's this?" Most adrenaline filled 10 minutes pulling out everything. Weirdly they only wanted the 2014 tax return for my I-134 and none of the rest of my supporting documents.
We waited for another hour until my fiance was interviewed. He said he was asked the standard questions of:
* How did you meet?
* Who typically travels to visit the others?
* What does your fiancee do for a living?
* What has your fiancee been doing since you started dating? (essentially a timeline question)
He was approved after about 7 minutes of chatting with the interviewer! Everyone who had gone before us had also mentioned that the Interviewer was very kind.
Also, my fiance was told that he should be getting his visa within 2 weeks, so we'll see how that goes!