Kindles are brilliant. I'm on my third, a lovely lightweight Paperwhite with a pretty cover. This makes it feel more like a notebook which is comfortable to carry, to hold or easily prop up in bed or even under the bedclothes. Backlit screen, adjustable light source and print size, nothing to disturb another sleeping person.
It's the 'book cover' within which there is every and any book you could want to buy, read, store. Easily re-charged for possibly 12 hours reading by connecting to my laptop. Small enough to fit into any bag or handbag and, somehow, easier to manage I feel than trying to grip a smartphone.
Loading books into my car for a break abroad and hating the thought of reading very slowly in order to make a good book last, I can recall on one trip loading 24 books. Who needs to be transporting 24 books at any one time? With a Kindle, you just download what you need into one small item, and then again and again, wherever you are.
For me it will never ever replace the look, feel, even smell, of a real book. But if you love to read and want the reassurance of always having a book to hand whenever you want it, without worrying about space or storage or extra luggage, a Kindle is a wonderful thing!