When do i buy Runaans?

Hi there! So i recently started to play ADC a lot more because it's busted atm and i want some freelo :p So i decide to main Caitlyn, And i usually go for BF sword-Rapidfire/Statik-Infinity Edge-Rapidfire/Statik But my question is, in which scenarios can i replace either rapidfire/statik for runaans huricane? I love the item and i think that it can help me carry games a lot harder. So in which scenarios should/could i replace rapid/statik? And should i replace the rapidfire or the statik shiv?
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