My wife has used the nook since the very first one came out. I'm a Kindle user. We typically buy books on whatever device we're on and then "liberate" the books and sideload them on each other's devices.
I had HUGE problem with whatever nook model used the MTP protocol to transfer books. It gave me no end of hell with Calibre. At that point, I really wanted to move my wife to the Kindle, because I had no issues side-loading books. Heck, if we were both in the Amazon ecosystem, there would be a lot less sideloading to do.
Then a new model came out that didn't use MTP anymore, but had the memory partitioned off, so you could only sideload to part of the device. And the sideloaded content would show up under My Documents instead of books. Calibre eventually worked around that problem. But it really soured my experience with the nook.
Now my wife is on a Glowlight 3. But the MicroUSB port on the bottom is super flaky. Sometimes it charges. Other times it won't. So, I let her use my new Kindle Paperwhite. I thought for sure the faster device and the larger screen would hook her, and I could get her off the nook. But no such luck. She claims she likes the UI in the nook a lot better.
The one thing the nook does have going for it are the physical page turn buttons. I think the 4 and 4e are probably the lowest price point to have physical page turn buttons.
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