Actually went very smoothly. I arrived early and there were people waiting for the mdecial. We went in and for some reason I was first on the list. No problems with that. But didn't make a lot of difference in the long run.
I arrived at the embassy, which was crazy busy. The embassy in London has concrete barriers and a LOT of security. Pretty cool experience. Sat in the waiting room and was called pretty quickly. He asked a few questions, shook my hand and said "Welcome to America".