The 950 PDF support (and also the 650) is much better than the 505. You can zoom in on the page. There is a special quadrant view for multicolumn PDFs that make it easier to move around the page. You can change screen contrast and brightness. You can crop white space margin around the page. I like the extra inch of the 7 inch screen. Since I read in mostly Small size, I can fit the whole page on the screen (and rely less on PDF reflow of the text which sometimes affects formatting).
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