Two more cents worth...
I've had a Kindel Paperwhite for well over a year now. Battery life is the best of all my electronic toys. A wall plug-in USB charger once a week to ten days overnight works well, even with fairly steady use.
It is strictly an E-Book reader, with no other applications available, nor does it have sound capability for audiobooks. As been said, it is NOT a tablet!!!The image though is very sharp, type size and backlighting adjustable, and pictures in grayscales viewable.
I usually have close to two dozen books loaded on it at any time, in many genre's, to vary my reading interests. I use it strictly for book reading material (I spend a lot of time in doctor's offices due to my wife's health issues--two year old Time mags are no longer of interest...).
My book selections come from our area's local library systems. They use the Overdrive e-book management system for their e-book licensing arrangements. It's not the easiest to search through, but workable. Some titles have multiple copies, others only one. You can put a "Hold" in on a title that is "out in circulation" and be notified when a copy is available. It will show you availability status, and sort selections in a number of formats.
My particular readings lean toward the late Tom Clancy, WEB Griffin, James Patterson (a very prolific author) as well as current biographical and topical publishings.
Book "borrowing" is done through Amazon. Using Overdrive, a copy is downloaded onto my laptop through Amazon. Using this methodology one doesn't need to have a WiFi connection (or put up with the ads) to obtain reading material. Amazon retains a list of what's been borrowed and returned. The initial borrowing period is usually for two weeks. That can be extended at least once.
I then use Calibre to manage the library I have. Using a USB cable, it downloads the book onto the Kindle while keeping a "copy" on its file shelf (it also charges the Kindle while doing so). Books can be moved on and off at will. Conversions are possible, but some are protected by a process labeled "DRE"--a copyright protection format.
There are many titles out there that are way beyond their copyright dates and considered "Classics" ("Tale of Two Cities", etc.). Then there are many "free" titles, many would be considered "Romance" novels. Many others are of the self-published E-Published variety--short pieces, some of which are even interesting. Of course, Amazon would be more than happy for you to purchase all your readings, but by borrowing from the library systems, you don't have to.
I do recommend a case of some sort as well as using a screen protector sheet on the window. A capacitance pen is useful for highlighting, word searchs, tapping on the virtual keyboard, and flipping pages.