I rarely use iBooks. I'm generally more comfortable using one of my EBRs for reading books, in part because they are more portable, in part because I find myself getting distracted when I'm reading books on my iPad.
If I do read a book on my iPad, it's more likely to be in the Kindle App simply because that's available to me wirelessly across the iPad, my iPhone, & my K3. So I'm reading a single book across the three devices.
But here's a nuance - I don't use my Kindle to read free books. I use my Sony, so I get my free books in epub format.
So IF I were to be reading a book on the iPad that I obtained from Mobileread, I'd be using iBooks.
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