When I bought my last computer, I did not heed the warnings of my sales guy who said to by a screen protector. Sure enough I had little markings from my keyboard scratching the screen. So, I'm very happy about this plastic thing. I have a retinal display so I'm particularly concerned about marks on the screen. It took a few minutes to figure it out. One small drawback: the product could have used a set of instructions. If you're industrious, though, you'll figure it out.
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