I actually want/need a digital sketchpad, and while I do read/annotate PDFs, this is not what I would do the majority of the time.
If this device would be hackable (run linux on it), I would find so many use cases for it that I could justify the price in a heartbeat.
Somehow, being a device from Sony, I expect this reader to be a piece of junk software-wise, to the point that I wouldn't be surprised that you need to convert the PDF into something else and use custom clients just to exchange files.
If you want a cheap digital sketchpad, look at the Boogie Board LCD slates. They're nowhere near as good as a proper graphics tablet, but you can draw and save stuff on them. High end model is around $100, other models more like $30.
If this device would be hackable (run linux on it), I would find so many use cases for it that I could justify the price in a heartbeat.
Somehow, being a device from Sony, I expect this reader to be a piece of junk software-wise, to the point that I wouldn't be surprised that you need to convert the PDF into something else and use custom clients just to exchange files.
I hope I will be wrong.