Get the model number and check the spec details like screen nits and color gamut on the manufacturer website. In general, though, it’s a good buy.

There will come a time when some of your apps can’t be updated because they will require a newer version of the operating system. That is the situation with my Tab S2. It is on Android 6 and some updated apps are no longer compatible with that. If they are apps that are critical for you, you will need to get a new(er) phone.

I will say yes because you are missing out on changes and improvements to the OS and UI, as well as future updates, as well as device improvements and capabilities.