I really had high expectations on this privacy filter when I ordered it, but after installing it I stopped using it immediately. The privacy functionality is too poor for me so I didn't dare to use it when commuting. On the other hand, everything about privacy is about how much privacy you need. In this case, I believe the creators of this privacy filter added more attention to screen brightness than on complete privacy. It means you can see what the person beside you does on her computer, but it is really hard to read or grasp anything useful the screen. But you will see open windows and colors on the filtered screen, you may recognise MS Word, Excel, etc., but you can't read the contents. This should be compared to other privacy filters where the screen of the person beside you gets completely black. So for me the privacy offered by this filter wasn't enough for me, but it may be ok with others.
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