It does not deal any dmg whatsoever to your havoced target (only to those around it), so it amounts to zero dps increase in ST situations, zero dps increase in spread cleave situations and ultimately zero dps increase in aoe because you don't cast Chaos Bolt in most aoe situations. Oh and in the rare case you may benefit from it, it deals 60k damage. Amost makes Sinister Seeds look good, almost.
GG.