Re: Why buy a dedicated e-Reader ?
I started with ebooks during a holiday where I loaded the kindle reader on my phone, for convenience when travelling. I loved it, but on my return, I went out and bought a dedicated Kindle reader. The phone (or, later, tablet) was completely usable, but the dedicated reader wins because it is easier on the eye and has greater battery life.
Years later, and I am now on a Kobo. What I love about both Kindles and Kobos is that you can be reading a book, but if you find yourself out and about withouth your ereader, you can bring up the corresponding app on your phone (which you probably do have on you) and continue reading from the point you left off. Pretty seamless and very convenient.
Relaxed reading, and long trips = ereader. Quick reading breaks while on the move = phone. You can have your cake and eat it.