Hi,
I do have the Kindle DX and Kindle 3. They both are really good with ability to zoom and pan but reading documents on the small Kindle is not a great experience; the bigger screen on the DX makes it better and almost no need to zoom. You can also use landscape mode that on the DX is almost everything you need. Pages turn are slow in the Kinde DX tought and firmware version on Kindle 3 is newer allowing couple of extra features.
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