I was thinking about buying it, because the stylus seemed to be much better than the one from the Sony DPT-RP1. However, I decided to buy the DPT-RP1 mainly for its size (13" is just perfect to read papers and taking notes!). The writing experience of the DPT-RP1 is not great, but I have been using it for almost a year now and would never go back. The amount of paper that I have laying around at work now is minimal.…
My favorite e-ink e-reader(I own several from 5inches to 13inches) by far is the original Sony DPT-S1.
It is so light for 13 inches (about 350g) and the software experience for PDFs is fantastic.
Sure it would rock to have ePub support, but Calibre can take care of that.
Sony made some questionable design choices with DPT-RP1 foregoing regular USB tethering for one and disabling of the anemic web browser which was no big loss but still was an option for emergencies.