Well my first ebook reader was a Sony. I bought it because I wanted the epaper display and could load books from different sources. My wife had a Kindle at the time and I was not interested in being locked into the Amazon ecosystem. After Sony dropped the ebook reader I bought my first Kobo and was able to move my books over, most had been purchased thru the Kobo store at the time any way. I then subscribed to BookBub a daily email that would send emails with free or low cost books by categories I choose. I usually just get the free books and have ~1000 unread in my library.