I love Apple for their duck head concept. And I hate them for not selling the different kinds of duck heads individually. Of course, they want me to buy the world traveller pack with six different duckheads for 40€. Yeah, the world traveller might make use of that. But it contains only one adapter of each kind.
More feasible for individuals visiting one specific country is this: Buying the local iPad power adapter. It comes with a power cord and a duckhead, both sporting the national kind of plug. This way, you can charge your iPhone or iPad and MacBook simultaneously.
Talking of power plugs: OMG the UK plugs and sockets are just ridiculous. But everybody should know that by now. I’m just re-realizing that.