In our view, its time to upgrade to Windows 10 for the majority of consumers.
If you are a business or use specialist software, there are additional concerns because some driver problems for printers, scanners & other specialist equipment.
You need to be aware that Windows 10 has some features that some may view as privacy issues. Most of these can be disabled, if you know how, but others are 'baked' in so they cannot be disabled.
For most folks this is not an issue but you need to go in with your "eyes open"