I primarily read books through Kindle and O'Reilly (Safari Books Online). I went through a couple different kindle devices. E-Paper type devices are good for

I primarily read books through Kindle and O'Reilly (Safari Books Online). I went through a couple different kindle devices. E-Paper type devices are good for prose, but not really that great for any books with graphical content and don't work at all with web content. I tried using a Kindle Fire, but the pixel density on all those devices is terrible. I had an older Fire HD for a moment which was decent at 254ppi, but it bricked itself during an upgrade. Amazon offered me a discount on a "newer" unit with 189ppi. I gave up and got an iPad mini with a 326ppi display. I mostly use it for reading books on public transportation.