Reading on a kindle is nothing like reading on a full digital screen like an ipad / phone though. I agree I really dislike reading on a mobile / tablet / PC, but a kindle is something completely different from those.
^^^ this, re the screen at least. I don't understand those complaints as it's nothing like a regular digital screen, easier on the eyes, can read in sunlight.
Personally, I have a mixture and find different options optimal for different purposes, my ideal is:
Kindle Fire: Mostly for anything non-fiction with graphics whether papers or books. (Though for large reference books, if I use them frequently, I will get a physical copy too). Also useful to watch Netflix etc.. when traveling, it's a nice enough HD tablet, no point in me spending way more on an iPad.
Kindle Paperwhite: Great for general reading both fiction and some non-fiction (so long as the latter doesn't require graphics).
The only reasons I have for physical books are; any reference book I might use frequently and jump back and forth with rather than read all the way through. I may still buy a few fiction books (especially in hardback format) like say I might want the complete set of Harry Potter etc. Whereas for some Jack Reacher type airport books I can have those on the Kindle.
Lastly (not ideal but just happens sometimes) if a book has been out for a while then the second-hand version can be way cheaper on Amazon so I might end up buying a physical copy anyway, can always give those away after.