By chance I have both. I bought the Iliad and then somebody shortly after gave me the Sony 505 as a gift. Anyhow, there are certain advantages of each. First, the Sony has MUCH better power management and the battery lasts many many times longer than the Iliad. the Iliad's bigger display makes a significant difference and is a real positive. I also like the page turning control on the Iliad much more. The Sony is easier to carry around. With the new firmware update the Sony turn-on and off times are nearly instantaneous, while it take maybe 10 seconds for the Iliad to start up. Sony now allows you to reflow PDFs, which is actually a better solution in some ways than the Iliad. When resizing pdfs in the Iliad, part of the page is not visible. Anyhow, before I end up rambling, there are plusses and minuses with each. If I were going to choose only one, I would buy the Sony because it is less expensive and the battery life is so much better.
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