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i think reactive task (JavaScript style promise) paradigm's are great for the mobile interaction use case. small segmented operations that async update the ui. block style coding mechanism are also nice because you can see the callback code next to the invoke. very interesting . seems like combining this with an JavaScript runtime would be even more powerful

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Here at Brightcove, we have been using ReactiveCocoa internally in our new iOS SDK. We expose some ReactiveCocoa to the consumers, but not a whole lot yet.

Overall I love working with ReactiveCocoa. The guys at github run an open source project the way it was meant to be run and are extremely helpful.

One downside is that it makes debugging memory leaks/crashes/retain cycles more difficult but that will be inherent in any block based API. It is still worth using it though.

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