The Sony Digital Paper is a minimal function device which features an eye-catching one of a kind 13.3" E-ink screen with two types of touchscreen tech (capacitive and Wacom). It ships with 4GB internal storage, a microSD card slot, Wifi, but not much else.
Thanks to its plastic construction, the Mobius screen on the DPTS-1 is both thinner and more durable than the E-ink screens found on most ebook readers. The Mobius screen is also why the DPTS-1 weighs in at a mere 12.6 ounces, which is impressive considering that it has a larger screen than most tablets.
Alas, while the hardware is nifty, the software is not. This device is strictly a PDF-only reader, meaning that it does not even support Epub or office doc formats.
I think that rather limits its usefulness, which is why I always suggest that a tablet, even a Surface Pro tablet, would be a better buy than the Sony Digital paper DPTS-1.