The poll won't let me select multiple answers.
I have several VMWare Player VMs running Windows 10 without issue. I don't plan to upgrade my current Win 7 and Win 8.1 machines to Win 10.
However, I had an old Acer Aspire One netbook laying around that wasn't being used so I went ahead and did the upgrade on it. Went from Win 7 Pro to Win 10 Pro and everything works as it should.
So my answers to the poll would be:
No, from Win 7
No, from Win 8.1
Yes, from Win 7