Sony and others have support PDF and PDF reflow. The reflow only works for text based PDFs. As long as they are text based they will open fine on the Sony and allow you to change font sizes. Reflow is not perfect and you will a few quirky formatting issues, mostly odd paragraph breaks and conversations that seem to run-on as one sentence.
If the PDFs are graphical or picture based you may not be happy with a 6" screen. The text will come out small and you would probably need to run it through a program to either crop the margins or convert to another format. PDF is not an easy format to convert.
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