Re: C looks more durable
I haven't read anyone here dissing the plastic. As far as I'm concerned it's the best thing Apple's done here. I hate their all glass all metal monstrosities. Wife has one, when I need to fiddle with it I'm terrified of dropping or scratching the thing and I find it uncomfortable to hold with it's sharp edges.
Of course these problems go away with a plastic bumper but then what's the point?
The bare shiny is only really useful for cliche web designers whose idea of a website front page is someone smirking at the camera with an iMac in the background and an iPhone in their hand.
For instance: http://webdesignledger.com/inspiration/18-examples-of-beautiful-image-usage-in-web-design