The diagonal of the screen is 15 cm. The width is about 12.2 cm in landscape mode. The colour screen technology is also from two generations ago, and newer colour screens are much better (633 has speckles on the screen in grayscale mode). I think it would have to be a very good price to be worth it these days.
That said, I bought one four years ago and still use it for reading novels and manga. I don't use it for reading A4/letter sized documents very much. I have occasionally used it for that, but the text ends up being pretty small.
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