Had my appointment this morning.
Arrived a little early (appointment 9:45, I was in the waiting room by 9:35/40) seen instantly as one of the staff was in a room looking bored.
Sat down, presented letter and passport. Asked a few questions, how often I travel to the US, what purpose. Do I know anyone there, what do I do etc.
Picture taken, prints taken, given a quick rundown of it all. In and out in 5 mins.
Had the confirmation email hit my inbox before I'd even made it out the sprawling embassy complex!