My Kindle (the original paperwhite) still sort of works, sometimes. But it kept locking up and having to be rebooted frequently and acting like it's a matter of time before it won't reboot at all.
So I stopped using it a few months ago and picked up a cheap epub-only reader to use until I decide whether or which 'good' ebook reader to buy--I only know I won't buy another Kindle.
Ironically my old Kindle Keyboard model still works fine--of course it hasn't been supported for a long long time but I can still sideload mobi formatted books onto it if I want.
Now that Amazon has declared my Paperwhite obsolete and useless for new books anyway, I think I might try the 'jailbreak and install KOReader' thing I've been hearing about.
If the locking up issue is a hardware problem and it gets bricked I haven't lost anything, but if it's just a software problem, that could fix it and make it more useful than before, and I'd have no need to buy a new device.