I arrived at the Garden City DO at approximately 10:15 this morning. My interview was scheduled for 11:25, so I decided to try my luck and see if the security guards would allow me to get in early. They politely told me to come back at 11:00, so I dropped my fiancee off at Bloomingdale's at the Roosevelt Field Mall and drove back to the parking lot at 711 Stewart Avenue. I should mention that there is plenty of free parking available, so don't worry about where you can leave your vehicle.
If anyone's interested: I had an appointment today for H1B visa revalidation. Overall it was a smooth experience. I was asked for my paystubs though.
Degree etc was not asked for. Total interview time was 2 minutes. The only question I was asked was whether I am working for the same company for which I had received an H1 visa previously. In my case that holds true. I also had an F1 visa previously. US Degree.