Went today and it was a fast, seamless process.
The Apple store across the street had a longer line than Tesla before it opened. I was about 6th in line, took me about 10 minutes before our family of 4 was all up in the 3.
3 of us sat in the backseat and I let my wife take the driver tour as this will be her car. I am 6'3 and I had PLENTY of leg room in the backseat and my head was nowhere near the roof. In my S, my head was bumping the ceiling and it was rather uncomfortable back there. Kind of weird considering the 2 vehicles.
The interior is absolutely spacious and feels so open and cleeeeeean.
It was a much bigger vehicle than I expected. Perfect size.
There were a lot of employees and very helpful and you can feel their excitement as well. They advised that this car will be here indefinitely and not leaving.
Overall, many things I love much more about the 3 than my S and it is a fantastic vehicle. They are going to sell a crap load of these things.