I currently have the Nook Glowlight 3 and the Kindle Oasis 2 for my dedicated reading devices. I also have a Nexus 7 (2013) and a bunch of phones and junk... but I don't really think of them as dedicated reading devices.
One of the reasons I have more than one right now is for the different ergonomics of each device. Gives my hands and wrists something different every once in a while so that I don't (hopefully!) get into too much RSI which I have a long history with and must be ever vigilant in avoiding/reducing. (I started experiencing immense RSI problems at University... so higher education has had a lasting impact on me... just not in the way that I had thought that it might...)
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