I've been using the 3M Gold privacy filter for about a month and it works great on my MacBook Air. I chose gold because it's a less common color and also because my MacBook Air is also gold, although it will obviously work on any 13-inch MacBook. The MacBook is just as easy to close as it is without, and offers decent privacy from side viewers (of course, anyone directly behind you can see what you can see). I recommend it.
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