I could only use the ancient Sony Windows client to get annotations of my PRS350. Perhaps the later Android based Sony ereaders are supported? They didn't last long and the T1 seemed buggy. I took it back.
I think Sony has now dropped their digital paper? Sort of dedicated PDF devices without ebook formats and no mass storage mode, so you could only manage it with their application on Mac and Windows.
Then there are things like Likebook etc. Unless you want bigger than 7" the Libra is good value and doesn't need any added apps or hacking to do what it's sold for.
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