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Pretty nice. I saw the 3D buttons, and my initial reaction was they looked a little bland. Then I clicked and saw it press in and immediately my opinion changed because it looked very cool.

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They definitely look cool, but also made me think I need to keep my trackpad pressed against my desk until the button had been fully depressed before any action would occur. Trained by too many 'slide from here to there to confirm' interactions, I suppose.

I'd actually say this is a usability problem. If i just tap my touchpad (on MBP), there's a click event registered, but it's very, very short. the response from the button depends on the duration of the click event. If I click and hold down the touchpad, i see the whole animation, but if i don't and just tap, i see either a quick flash or no animation at all. This could be really confusing, especially with the skeumorphic buttons that look like they would react in they were clicked ("I clicked it, but did the click register?")

This could be fixed by adding a minimum click length for the current animation to occur. If the click length is lower, the full (or a partial) animation could just automatically occur at a fixed (fast) rate.

Nice point, make a pull request and I'll merge, or you could file an issue and I'll fix it when I have some time.

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