Actually, I only use my HDX to read at low light levels with white text on a black background. I use the PW 2013 to read at normal and high light levels with black text on a white background. If the PW was able to have white on black and black on white, I would probably only really need a PW.
The only other uses for my HDX are to play music and the AcroBible app. I also check the weather on my HDX but the PW 2013 also has an AccuWeather Active Content app.
Now that I finally got my network to stream music to my Grace radios, the HDX is looking less necessary if the PW gets a major upgrade so as to be able to reverse text and background colors.
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