Below is an excerpt from an interview with Jony Ive and Marc Newson who have recently been working together designing Product Red charity products for auction. I recommend you read the entire interview. I was impressed by their attention to detail. All aspects of their products are designed with the end user in mind. 

“We are both fanatical in terms of care and attention to things people don’t see immediately,” Ive said. “It’s like finishing the back of a drawer. Nobody’s going to see it, but you do it anyway. Products are a form of communication—they demonstrate your value system, what you care about.”

http://www.vanityfair.com/business/2013/11/jony-ive-marc-newson-design-auction