I did my Dropbox on 17 nov17.
I will begin with a sincere thanks for all the information I have got from these forums over the last few months and the amount of confidence I have gained through it.
Now, its my turn give back something by sharing my experience and hope this helps in giving some information to the others like me.
My visa was scheduled for 08:15 AM I reached the car parking in the nearby Malcha Marg parking by 7:45 AM. It is few minutes walk from there. I reached embassy by 7:55 or so. I was with my wife who would get an H4.