I have Windows 10 since July 2015 when it came out. I love it and have no problems with it - I can from Windows 7 on my little one.
However, my husband, who is using Vista on an old laptop didn't like 10 on his new one.
In any event, they will be discontinuing support for 7,8 and Vista and that isn't a good thing.
The upgrade to 10 is free still but that will change too, I think in the summer sometime.