Page turn buttons are too small? Just how big do you expect them to be? If anything, the 'next page' button is slightly too large. I don't notice any loud clicking sounds either, especially nothing too audible. If they also made them more sensitive to press, people would be complaining left and right about accidental page turns.
I have never had my pages change or text shift, no idea what's going on there. Might be a problem with the book's formatting.
If you find the screen too dark, get a book cover with a light so you don't have to always find a lamp to read under.
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