Kris said almost all I wanted... I'm too late!!
I don't have the paperwhite, either, but I'm pretty happy with my Kindle. It's exactly as a book, regarding the light: is there external bright fantastic shining light? You'll read it perfectly. Is there only a dim light? You'll read it with difficulties. There's no light? You'll knock your head with the wall
In that, the experience is the same than with a paper book, except that a paper book can have different shades of white, and Kindle only has one
I don't read colourful books, either: for those, I stick to paper. I use Kindle mainly for too-weighthy books impossible to carry everyday on the train without growing new muscles you were not aware of, and free books you can freely have through Kindle.
If I buy the book in Amazon, I use the Whispernet thingy. If I get by other means, I download it to my device with the cable
And I don't know too much about other devices... Kindle has been the first and, up to now, the only e-book I used. I'm pretty happy with it, though: I only must remind to recharge it from time to time (almost a month without need... and I do read for 2 hours per day!) and thousands of books ready to fit inside that tiny thing...
Even after that, I have to say: paperbooks are the best, do not say good bye to them!! Simply use the one you need best to the moment