Apart from what Mark has highlighted, I'd like to add the following.
I'm using the DXG mainly for reading PDF technical books (especially in I.T. and trading related textbooks.) and I find them highly useful.
Although most of the textbooks pages are larger than the DXG's screen, it has the ability to automatically trim away the blanks surrounding the text which make the text very readable. The downside of this automatic function is that if a page has a smaller print area compared to other pages, then you will find that the fonts of these pages will be larger then the rest since it removes more white blank spaces.
Another problem is that the PDF text does not seem to be as sharp as those in mobi format. For a PDF book to be displayed well in DXG it must be an "original" PDF document. If the PDF is made up of scanned pages, then the result is usually not satisfactory.
Hope the above help!
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