I arrived at AT&T 10 minutes after they opened and they were sold out the 4 phones they had. I was the first person to get on the waiting list. There were 5 people behind me waiting to get on the list. They did receive one more phone that day and I got it. I suspect the demand was higher that day than the available inventory.
As for the phone, I love it. Showed it to my wife and kids (14 & 16). The kids raved about it, and my wife (not a technology nerd) was surprised she like it so much versus her iPhone (3G). The UI is very slick, usable and responsive. This is not your typical Microsoft version 1 product. It feels a lot more like it came from a first class consumer electronics company than a business software company.