Bought this for the college classes I'm taking. Our tests are online but in the classroom and I worry that people are cheating around me. It reduces glare, which I really like, and when I write on it with my Surface Pen, it feels more like paper than before. It does a good job of hiding my screen when the brightness is at normal levels. However, you can see in the video that it is almost completely darkened when the brightness is completely turned down. I've seen some reviews that said they couldn't see their screen if they lowered their brightness, but I haven't had this problem. The touchscreen also works perfectly, I didn't notice any change. If you're looking for something that isn't insanely expensive and works well, I'd recommend it.
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