Conclusion: With its built-in card reader, big hard drive, excellent screen, and RAW support, the Epson P-4000 is the best photo viewer on the market, but it won't cut it as a general-purpose portable media player.
Pros: Best display on the market. Broad video file format support. Caters well to photographers' needs. Built-in SD and CF slots.
Cons: Bulky, expensive, subpar audio quality. No WMA support. Browsing structure is entirely folder-based. Eight-character filename limit. Horrible battery life.
Summary: The Epson P-4000 currently represents the best compromise
between having a laptop computer or one of the other portable
storage devices on the market. You can use the Epson P-4000
both out in the field where speed, battery life and successful
data transfers are key, and later for showing your work...