I agree that the screen quality for the Sony and Kindle is about the same. Both are good. The Kindle refreshes a little faster.
I just read a PDF on my Sony yesterday. It was not perfect, but it was acceptable, even after I increased the size so I could see it comfortably.
And just so you know, you can load the Sony library software on your computer and use it to load your ebook reader with files from your computer without ever visiting or using the Sony store.
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