tried it and it almost destroyed my computer. It took a week to clean it up.
Same thing happened to me last July.
Recently (about a month ago) I mistakenly started the "update" again and my initial attempts to stop it were unsuccessful. Knowing what I did before to finally roll back to Windows 7, I decided to wait for it to install 10 and then roll it back again using my experience from before.
It downloaded and installed so quickly that I decided to give it another shot. I haven't had any problems since