Windows 10 - Convince me.

[Elodan]

is windows 10 free forever?

If you get it in the first year of release and install it on your machine (assuming you have an eligible version), it's free. After that you'll have to pay to get it.

Windows 10 upgrade FAQ:
http://www.microsoft.com/en-us/windows/windows-10-faq

 

[GMMichael]

Why should I upgrade to Windows 10?

Because you like privacy invasion, no control over updates, and a seemingly random shifting from your program in use to a background one?

I hear the gaming framerates are a tiny bit better on 10.