Generally I'm one to disagree with Jon, especially when the subject of cases comes up, but he's actually spot on here.
The damage to the NSTG linked above is from a remote control being dropped on it, a screen protector wont guard against that short of it being one of the glass ones, which of course adds a reflective layer to a device with a generally matte screen. And even those are not going to always prevent damage. Mostly because eink screens are more delicate than LCD screens.
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