Considering it has been released to 190 countries, the deployment is running really well. I haven't experience any problems with the in place upgrade. There are some huge benefits to upgrading from 7 or 8 to this. Start menu back. Multiple desktops. New notification system. Cortana search (like Siri for desktop). Camera login. The new Edge browser. It's free for everyone on Windows 7, 8 or 8.1.
I miss the old days when you could get an exclusive from SDCC both at the show and online the next day and it would stay up for a few days. Hasbro would actually have enough stock to sell for anyone that wanted one. The Hot Wheels guys have completely destroyed this hobby.