Just installed Windows 10. It was kinda an accidental install - Had scheduled it to be installed late night on Sunday but it started the upgrade on re-start.
Having said that, it was quite a smooth install. The upgrade from 7 to 10 went by without a glitch...and it was ready for use when I went back to use it later in the day.
My first impressions of Windows 10 so far has been great. Pretty impressed with how crisp and modern it feels, while at the same time, does't make you go looking in to 10 different places to do the things you are familiar with. (In contrast, I still get lost when I try to use the kiddo's Windows 8 laptop)
So far, +1 to you Windows. Thanks Obama!