If someone is sitting next to you, he will see just some rough sketch of what is provided on the screen. And that is if he explicitly tries to get a sneak peak.
3M Privacy Filters show their biggest strenght in the situation where for instance you are working on your computer and someone walks near by and tries to look at your screen. Look at the following examples.
View of the Asus Eee without the 3M Privacy Filter:
View of the Asus Eee with the mounted 3M Privacy Filter:
As you can see, these filters really do make a difference. I am traveling in 4 days and the custom resized 3M Privacy Filter will definitely be of a good use while working on my Eee in the airport lounge waiting for a connecting flight to Dubai.
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