We had it installed about 9 yrs ago on the windows in our sun room. As mentioned above, there are various grades. We had a darker one on the window that got the afternoon sun and a lighter one on the others. We don't even know it is there, have had no problem with it.
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A people free to choose will always choose peace. 
Law of Logical Argument: Anything is possible if you don't know what you are talking about!
Since light travels faster than sound, some people appear bright until you hear them speak
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