Affliction warlocks, going for soul effigy? Siphon life? too much work?

Just curious whether people are bothering to build these two talents into their rotations or not. I'm not even certain how to do soul effigy, probably just add it as its own thing

Code:

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/cast [nocombat] soul effigy

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Code:

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/focus soul effigy
/castsequence reset=combat [@focus] agony, null

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Thoughts?

the biggest issue that void told me about this talent is that it's hard to target "your" effigy if you are running multiple affliciton locks. Ended up being a cluster and needed to use a different talent.