Best UI you ever used

Hi everyone,

today I happened to find a thread on UXExchange titled "The best UI you have ever used...?"

While the thread isn't as insightful as I hoped, I thought to throw that question at you guys. Guess we agree that this is mostly about sentiment and not quite measurable :-)

Since we want to maybe learn something, it would be nice to submit some rationale, too. And to further narrow it down, please stick to web-based UIs.

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I like the UI of Feedly. It hides unused complexity but can reveal it once needed. It makes reading feeds fun again.

Thanks for sharing!

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Sascha