Last night, I spent about an hour to upgrade my pc to Windows 10, because the free offer from microsoft for Windows 10 Upgrade will be end on July 2016. I don't want to miss that. Moreover, I have finished the major projects.
I got Toshiba Satellite which I bought it around September ,2015. That is already tested by Toshiba to ensure Windows 10. Thus, I have no problems for the upgrade. Moreover, all apps are working such as Android Studio, Visual Studio. Not bad at all, that sounds faster than Windows 8.1. I am happy about that! And I got back the "Start" menu which I love since Windows 95!

I wish you got same lucks as me!