If you’re curious why Berkshire Hathaway is so high on Apple, it’s partly the Cupertino-company’s management and partly you. Yahoo Finance had a few words with Berkshire vice chairman Charlie Munger. On the management side, Munger says:
I think Apple is one of the strong companies and will stay a strong company… I think it's ungodly well-managed…
As for the you part, Berkshire’s vice chairman said:
I judge the strength of the company based on how much the customers love it… And I've got zillions of friends who they'd almost part with their right arm before they'd part with their iPhone. That's a hugely powerful position to be in.