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I upgraded (clean install) friends and family to W10 and have had no problems at all. I expected some issues but they are very happy with their OS.

Other tech people, you dont need lots of silly tools, set the 2 reg keys in this article and you will get no upgrade or notifications

https://support.microsoft.com/en-us/kb/3080351

I can't understand why people are obsessed with using 3rd party utils, or hiding updates to do this when the process is documented and easy

Also the magic bullet it to use Windows 7 or 8.1 Enterprise. These are not eligable for the upgrade and never download the W10 nagware in the first place.