Speaking as someone who had these on his PDA (InvisibleShield), I can say that they cut the glare remarkably due to the textured surface not reflecting light the way a smooth plastic screen tends to. They don't affect touch sensitivity on these non-capacitive screens at all... but as to the contrast, I can't say I noticed a difference with TFT LCD screens. Whether e-ink will be more affected by it, I can't properly say - the TFT's had backlighting, which probably helped compensate for anything that the screen protector did.
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