So Microsoft want me to upgrade. I mean... They REALLY want me to upgrade. I've been holding off because honestly, 8.1 has been working fine and if it ain't broke don't fix it. My other biggest worry is that I have some programs installed that may not have been obtained by the correct means, so to speak. I'm not sure if I read correctly but right when Windows 10 launched I thought I heard that it was better at detecting stuff like that.

Either way, could people who have it give me a run down of what I'd be missing out on and anyone that could have upgraded and didn't let me know why. Will I regret not upgrading while it's free?