I bought a 16gb black via the reserve system but I really wanted the 64gb. I was hoping that I could get a 64gb when I picked it up that day but they told me they had to sell me the one I reserved. Anyway I'm in NJ & want to know if u guys think I could just bring it into an apple store and exchange it without reserving a new one. Do you think there is enough supply yet? I bought it last Friday. Thx.