Exactly. I resisted using the Kindle app on my iPad for a number of years, as I much prefer the feel of a book in my hands. But once I gave it a try, I was hooked. Being able to carry around a small library in my iPad has come in handy in more ways than I had imagined.
Added to text size as a benefit is the ability to look up a word by selecting it. Not as satisfying as using my SOED, but in the moment, it works enough to get by.
I still prefer the look, feel, and aroma of books. Even paperbacks. But the sheer utility of the Kindle App or Books is too much for me to pass up. So I use both.
I love books, but I am so hooked on my Kindle that is the only way I really read now. With the exception of my comic books and graphic novels, which I have started to purchase and read on my iPad, all of my books are purchased via the Kindle store. If I can't take the Kindle with me, I use my iPhone Kindle App and read while I am out. The fact it syncs across all my devices is a big plus for me!