I got my 16gb from MacMall the other day (shipped to me in Austin, TX). I was hoping I wouldn't have any issues, but I've got the screen separating issue.
I'm going to call them in the morning to see about returning it. What sucks is that I think you have to send the product back first, wait for them to get it and then they'll send you a new one. I hope that's not the case. I don't want to be without my N7 now that I finally have one.
I'm also noticing some pretty substantial flickering of the screen when I'm browsing online. I tried to ignore it at first, but it gets pretty irritating. Hopefully my replacement won't have any issues.