mickzster wroteWindows 10 is definitely worth the upgrade.
It is not necessary to download the update via Windows Update because you'll have to reserve an upgrade. Instead you can download the .iso image directly from Microsoft's website and install Windows 10 via a bootable USB or run the setup immediately from Windows 7 to upgrade.
I don't recommend installing the .iso because I did that and I couldn't use my key. Had to crack it, sadly...