I picked one up this morning. The AT&T guy was really knowledgeable about W10M. He guided me through the initial setup. The phone asked me for Microsoft Account detail when turned on for the first time. Upon doing so, it detected my Nokia Lumia 920 and allowed to fetch everything from there. After that it kept on fetching all backup data for 10-15 mins. In the end the result was amazing. It restored all my contacts, apps, even the start screen!