I've been watching this thread ever since the 13th and I thought I would go ahead and share my experience.
On the 13th, I sat on the Google Play store with the Nexus 4 up and ready to go whenever it went live. I practiced buying a Nexus 7 just to make sure all my information was already filled in and so that I would know just how many clicks it would take in order for me to secure my Nexus 4 16gb. Starting at around 7:00 AM EST I monitored the store refreshing every few minutes; no extensions or anything, just hitting the refresh button. Finally at around 11:32 AM EST I saw that it was live and I actually did a double take because I thought they would go on sale around 12 like everyone else.
My purchase was relatively easy. I didn't have any lag problems with the store and I only suffered one minor hiccup. I hit add to cart as soon as I saw it and the store took me to the cart but it was empty. I hit the back button then added it to my cart again and it was there. I hit my address and card information and confirmed everything. It was the fasted 384$ I had ever spent. But besides the first tiny issue, I had no problems at all. I got a confirmation email just a few minutes later and now my UPS status says that it will be delivered today(11-16-12). Overall I haven't had any issues. I placed my order with no issues and they took my money with no issues.
Sorry for the novel I just wrote. Here are some additional details just in case.
I am in Northern GA, about 2 hours north of Atlanta.
I placed my order at 11:33 and 13 seconds Eastern time and received the confirmation email at 11:34.
My package started in Kentucky, went to Tennessee, then to Atlanta and is now in Roswell for delivery.
I hope this helps you guys!