I’ve been using Kindle e-readers since sometime before 2010, but my latest one, a Kindle Oasis, just wasn’t doing it for me.
It was glitchy. When I went to wake it back up, I would very often find that the font size had changed or the page had changed. It needed charging every 4 days (and that was with wifi off). The backlight seemed to randomly adjust itself and I would often turn it on at night and would need to find some other light so I could turn on the backlight.