Recent research from iSuppli shows that even though the iPhone 4S is more expensive than the Lumia 900, Apple actually pays less per part than Nokia does. The biggest individual price difference is between displays; Apple pays $37 for theirs, Nokia pays $58. All told, Apple pays $190 in parts, while Nokia pays $209, which leads to Nokia making a $241 margin per device, and Apple making $459.
Apple's eccentric co-founder and longtime gadgetphile, Steve Wozniak, decided to get himself a shiny new Nokia Lumia 900 so he could have a bit of a play with Windows Phone and... he likes it. And this should surprise precisely no one. It's a great new phone and Woz tries every great new phone that comes off the assembly line (he has a chair reserved at the end of the conveyer belt, we're told).