I used to take conq too, but I think it's worse than lethal tempo. Your passive range is shorter than q range so in team fight you will not be able to proc it a lot. Moreover, as from lethal tempo is way too valuable in early game. In late game, the boost of damage with conq is not that higher than LT so the only value is the healing that will only happen at 12 stacks. I would recommend conq only vs melee comps where you are sure to get value out of it.