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UPDATE: I was in the Apple Store yesterday and the glossy 17" MacBook Pro screen DOES close when at an angle.

And also their screens are much more loose than the one I have. It must be from people opening and closing every second.
 
The screen on my matte uMBP 17" is still loose. At least for me.
It's tighter than 15" models, but it still falls when lift it up vertically.
 
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