https://www.theregister.co.uk/2017/10/18/windows_fall_creators_update_is_here_and_the_news_is_both_good_and_bad/

Hands On Just over two years after the introduction of both Windows 10 and the "Windows as a service" concept, Microsoft has released the Fall Creators Update. We took it for a spin.

Microsoft’s efforts in making in-place upgrade smooth have paid off. There will always be cases where things go wrong, but the speed and reliability of the in-place upgrade is generally good.