The actual design of the building is beautiful and marvelous.
But I have to say that the entire design of the campus is a little disappointing. The buildings on campus are completely isolated from the rest of the city of Cupertino. The campus will be separated by a new security wall/fence surrounding the perimeter that will prevent all unauthorized entry, and most of the buildings will be hidden behind substantial landscaping. The plan also demolishes a city street that will disturb local automotive and bicycle routes.
Apple workers will get to appreciate the beauty of the architecture, and the calmness of the natural park-like setting, but the public will have to gaze from a distance.
I think Apple had a chance here to integrate the campus more closely with the city, and the city had an opportunity to ask for more of a community feeling than an ivory tower feeling. What if the park-like portions of the campus were an actual public park? The public could appreciate the architectural wonder and feel that the campus was at least a little bit a part of their city. What if the campus had more walking-friendly routes to and from the rest of the city, to encourage interaction between workers and local businesses? Facebook did this, by basically buying a little mini-city (http://mediagallery.usatoday.com/Inside+Facebook%27s+headquarters/G3949) which integrates work and life elements. You'd get a better city, quite frankly.