I bought this because I had eye problems from screen glare. It attaches to my screen very easily with a magnet, and it's nice to be able to detach and reattach it in a second if needed. It didn't completely shut down my Macbook, but not to the point where it was an issue. The privacy feature definitely worked - someone sitting next to me couldn't see what was on my screen. But while I could find that it reduced glare somewhat, it didn't help with my eye strain issue overall. I tried well for a month but finally gave up.
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