If you are a bunch of wise bitcoiners you should not definitely upgrade to Windows 10.

For a series of simple reasons:

a. it's buggy;
b. if you don't revise the privacy settings you'll end up share everything with Windows;
c. why it is given for free from a corporation like that? Easy and clean because you're the product for them;
d. it has been presented as the best windows ever: it is not;
e. cortana is useless.

the list goes on and on...