I trust the frog when it comes to balance ideas, or at least I give him the benefit of doubt. If he believes Vacuum is still too strong he may even be right.

However, when Vacuum is at 32 seconds cooldown and Wall of Replica is on a 100 seconds cooldown and your other 2 spells and buffs you have a melee hero with lots of doing-fucking-nothing. After you throw your big combo you may as well go make some coffee.

If Vacuum is strong enough to be on such long cooldown maybe the spell should be changed to something else. People call Sniper and Wraith King boring heroes but I dread the idea of playing Dark Seer and spend the whole match putting Ion Shells on creeps and using my combo once every blue moon.