I went through the line, non automated, last Friday. It seems like the same system that they have at Heathrow. The confusing part for lots of people is the putting your carry on in a tray. And your two trays won't be together, which has a lot of sporadic travelers who just got opted into Precheck for this one flight extra confused. One person in front of me was darting around trying to grab the trays from the back belt so her purse and carryon were next to each other.