Don't know if you're still looking but it's the Sony. I am an engineer living of technical PDFs & I bought the first edition Sony and, while not perfect, I could annotate and instantly see results on a PC without issues. After 3-4 years I traded for the Boyue Mimas and that was a mistake. I wanted a backlight to read in dark and reviews were good. While a good notetaker, PDF are unusable on this device. Now I'm waiting for the 3rd edition Sony. Bad thing is the Sony is $$$$.
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