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I never heard that it would lighter, but you may be right, as with a matte version you don't have the extra glass panel. The weight difference would most likely be pretty small though.
 
This is an option, but I really like the way the bezel on the matte screen looks.
If you really want Apple's matte version then you should sell off your current computer and get a matte version. If that's not a good option for you then the other matte conversion choices will have to do.
 
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