I would add unless you have a enormous library including very large book files such as audio books, comics/manga, recipe books and large PDFs I question the need for expandable memory. I have about 900 Kindle books downloaded on my Oasis 2 with 32 GB and am actually using 1.53 GB according to my memory use listing and Epub files are on average less than 1/2 the size of Mobi and Amazon AZW3 or KF8 files. I like the idea of expandable memory, and have many readers with it, but question the need in most cases for more than 4 GB memory as a practical matter for most users.
There is the advantage of being able to use the expansion slot card as external storage for books, at least on the Sony and Kobo units I have. One Sony PRS-950 I bought from a Russian source had a 2GB expansion card installed with about 500 ebooks on it.
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