I like the way W10 is heading and will UPGRADE my present OS.
I like W10 but would ONLY consider a clean install.
It's been fun but I will not be using W10 as my main OS in the near future.
W10 is my favourite OS.
W8.1 is my favourite.
W8 is my favourite.
W7 is my favourite.
Vista is my favourite.
XP is my favourite.
Another such as OSX or Linux.
If a download of an ISO is available that's fine with me,, at least. .. In the end MS has a lot to explain to clear this up.
There is no doubt in my mind that I will upgrade to Windows 10. I've been using Windows since 2.0 and that even included Windows Millennium (which I actually liked). Windows 10 should be a winner and I suspect many will jump to it when the word gets out.
I will upgrade but like all installations, I would like to perform a clean installation as a basis to create images from.
I'm sure MS will have a way for system builders to legally install Windows 10 on a new computer without the need to install a older version of Windows first.