It's pretty cool, in an industrial chic kind of way, but not that practical. Imagine how cold that thing is going to feel in Winter!
I also worry about Ive's love affair with aluminium considering how environmentally expensive it is to produce. He should give part of the proceeds to clean energy research to support his ongoing use of the material!
Hopefully it's made from recycled aluminium, maybe reborn from the death of a thousand Mac Pros!