For one thing, they sweated the details. The greatest testimony to their genius is just how much of that original design is recognizable in today’s Mac OS X 10.9. A Mac user from 1984 could sit down in front of an iMac or MacBook today and recognize it as a successor to that original machine. That’s simply amazing.
John is so right. Apple sweated the details and they still do—that sets them apart from every other company.