Ah, the I-20. Keep that one on you, it's like oxygen once you get over there
I got asked a few questions about what I was studying and why I was heading to the US, not much else. I'd say the total contact time was just over 5 minutes, add in many hours of waiting about.
The chap questioning me was friendly enough, I was a bit apprehensive. My list of visits to the US was half-remembered and quite long, I was worried that it wouldn't match up with their records, there was no issue.
You'll have to hand your passport over at the end, they'll get it back to you in less than three days with your visa inside. Think mine was on my door the next morning.
Have you paid the SEVIS fee? That was the only part that annoyed me, having to
pay to get onto the Homeland Security list, bah.