However, I still have every galaxy note I have ever owned, working, and in great condition (Note 2, 5, and now 8). My dad is actually using the 5. All of them got upgraded at least once to a newer Android OS and they are still solid devices.
Granted, other than Note, I've only owned a Startosphere for the hw keyboard, so I can't compare it to others, but even after I realized that the Note 8 was crazy expensive and made me double think what my next phone will be, I worry if the longevity can be matched.