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I dig. I'd be curious to see your other implementation that you show at the end.

That said, I still have a hard time seeing how Pop is much different than iOS 7's animate with springs API.

I haven't done a tut for that yet but the source is here: https://github.com/jerols/PopTut

One thing I see right off is that it's iOS 6 compatible. I still have apps supporting that, so this is way more useful to me.