BenLee is right about the troubles with PDFs and 6" screens. I have the Sony 600 and the best way to look at PDFs is in landscape mode. Then, half of the page displays at a time. You see the top half, then turn the page to display the bottom half. You might get tired of turning the pages so often but it's easiest to read text that way.
If you have some way of formatting the PDFs for 3.5x4" paper, they will look great on the 6" screen when in regular portrait mode. The other options available are to zoom in on the text, which means you'll have to scroll down to the bottom as in landscape mode and redo the zoom after every page turn, or increase the font size which will totally ruin the text reflow.
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