I think this is pretty much my first time getting my hands on an e-ink device.
The e ink screen is decent under normal room light. The texture of the screen is very different from my smartphone or my tablet. And I like it. In case you don't know, I still prefer physical books because I love the weight of the book, the feel of the paper, and the smell of the ink. I read ebooks solely because I have to move several times in the rest of my foreseeable life, and I love books, so I don't want to damage them. If I own a house, I'll quickly fill it with books.
Anyway, this screen reminds me of the feel of physical books, and I liked this e ink screen when I was under room light. But guess what? Under the sunlight, I LOVE it. Amazon makes such good hardware that I didn't regret making this purchase. Even compared with Samsung or Apple's flagship screen/display, for reading, Kindle is the best. Period.
But of course, their software sucks. That's why we need jailbreak to fix it. After playing around with koreader, I think I'll stop reading on my phone even though it was a good experience. Now I have a better device for reading.