All complaints about compatibility and accessibility are founded. It would have been much easier to have them as usb.
But all this is forgotten when you can use it instead of A4 doc prints, journals magazines. It's an invaluable tool.
Extremely light, comfortable and very good pdf processing and annotations.
Someone above mentioned Sony buys the eink screen for 650$.... if that's true, I almost pitty Sony as much as my own account
.