Windows 10

Still hackable Like everything else.
End of privacy
End of you being the owner of "your" stuff.
More domestic terrorist charges due to more intrusion.
More government oversight into what you are doing online.

Ever see that movie where the government arrests people because they saw them commit a crime in the future?
They would LOVE to be able to do that, but this is as close as they can get so far.

Ask yourself this one question.
(When has Microsoft EVER given ANTHING away for free?)