I've been visiting my sister for a couple of weeks and due to the fact that she doesn't have any extra space for me to 'deploy' my 17" MBP and my peripherals I've been using it on my bed most of the time. As we all know it has a pretty heavy display. On the bed (on my lap) when i type, the display tends to 'vibrate' a little because the machine isn't on a steady firm surface. I was just wondering if this will affect my hinge in the long run. Also a question to other users. Does your hinge have like a springy action for the first few moments when you pull the screen to either open or close it? Thanks.