They have hit a homerun with Windows 10. I am very happy with it.
Windows 10, in my opinion, is a great improvement and upgrade.
There is nothing wrong with Windows 7. I've had it from the beginning.
Windows 8 and 8.1 were on a par with the Vista upgrade.
It's basically the same as 7 just enhanced and everything, including the browser, seems to run faster.
I don't think there will be many wanting to return to Windows 7.
I've had the Insider Preview for about a month. I only installed it on my laptop first but after a few days of learning how to use it, I installed it on my desktop computer.
(I can see how others with only one computer, would be wary of doing this. )
I almost compare this upgrade to Windows XP to Windows 7.
I am very happy with it and there is a Recovery section that allows you to go back to Windows 7 if you cannot, or will not change with the times... Peace Jerry.