Windows 10....yay or nay ?

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I got a new laptop at the begining of this month, its got windows 8.1, and it keeps trying to get me to upgrade to windows 10. I don't even like windows 8, but that could be because I'm so used to windows 7, eventually I imagine I'll get used to windows 8, but its only been a week since I've had this. Do you guys have windows 10 yet ? Is it worth upgrading to or should i just stick to my current version of windows ?