So I'm going to buy my new MBP in a few days and since it's a big investment for me I would like to protect it. I'm in love with the Twelve South book case (http://zapp5.staticworld.net/review...south_bookbook_for_macbook_air_1116805_g1.jpg), I love that I can just open and use since the reason I never use my current sleeve (http://www.humac.dk/sites/default/f...mac/products/TR-ALS15-SIL_1.png?itok=096cfwj8) is because I can't be bothers fiddling around with it all the time. But here's my concern - I've read that some people have trouble with using the computer in cases and overheating. I do some heavy stuff (3D, rendering etc) and this is already a problem for me on my iMac and my current MBP without any cover. Does anyone have any experiences with this? Is there something I can do to protect my MBP from overheating if I buy this case? Is there a slim usb cooling pad I can place under my MBP while in the case? Is this even something I should be worried about? Is there a better case that won't potentially cause this problem?