At first (maybe as they call the model "Touch" ?) I was really giving it a good swipe, but a few inadvertent page turns from barely touching the screen with a smaller quick swipe made me realize how sensitive it can be.
I had a two-column per page PDF that was a nightmare on the 505 -- either squint at the tiny Small font, or go to Medium, which shuffled the text between columns quite a bit. The 650's "quadrant" feature means I can easily read each page, with just a couple of extra turns.
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