Windows 10 Initial ThoughtsShort version...More Like This
Long version: Possibly the definitive version of the modern Windows OS. Everything is much simpler, it's easier to navigate through your start menu, most if not all of the software and apps I use run a lot more smoothly, and Microsoft Edge is EONS better than Internet Explorer.
If you can, I highly recommend getting the free upgrade to this. It's well worth the time if you have the specs to run it.