Last year my DH asked if I wanted an ereader. He did a lot of research and bought me a Sony. I liked it at first. You can easily increase the print size. But then the battery did not last long. It got to where it would only last 2 hours after a recharge. Don't understand that since it wasn't in color or backlit. Then, the really annoying part was that you could not have pdf files and epubs on the reader at the same time. If you do, then you can't access the epubs. Really annoying! A young man at the library who's a computer/ereader wizard tried to work with us. He said the Sony was the only one that had this problem.
I was really getting frustrated. DH took me to Barnes and Noble to look at the Nook. I fell in love the the Nook Color. Even though it was twice as much as a regular nook, it did so much more. It has internet capability and you can enlarge the keypad to type on. What's really ironic is that the Sony, when we bought it, was $300! It drastically came down in price shortly after we bought it! So, the Nook Color at $249 was actually cheaper!
My books from B&N download directly to my Nook. They even have monthly freebies and also a discount list. New releases are expensive, but they are no matter where you buy them.
And you know what? A few years ago I purchased 3 online books from Quilters Paradise. I downloaded them to my Nook. They are not formatted for it, but they are readable. So if anyone else from this board has purchased those books, try downloading them to your ereader and let us know how they look.
I'm retired so I don't work for any of these companies, nor does anyone in my family work for them.