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Keys will be different than the new macbook air - and it may affect backlighting - in fact probably will. I also wonder how ventilation will suffer since generally speaking - apple vents through the keyboard..

Anyway, just some thoughts
 
Same thick silicone ones you find on ebay, hard to type on. Back lighting is blocked out, if you want something that feels like a Moshi but don't want to spend $20+, go for a TPU cover on ebay.
 
Just got this and it fits well but the lettering is misprinted having double letters. I contacted the seller to send me another but haven't heard anything yet. I think it may also cause overheating and leave marks on the screen when the lid is closed.
 
there is a video review of this on youtube and unfortunately the letters on the cover are all blackout even with backlight , so no go here
 
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