How is Zz'Rot exactly utilized?

I picked it up because it has pretty strong defensive stats (minus no health+), but I couldn't find a productive or efficient way of using it...Since towers one shot each Voidling before they could even get to the tower to blow up, it was pretty pointless trying to stealth-siege a tower from the jungle. On another note, it has hardly any lifespan while travelling the lane. This item has some siege potential and probably would get picked up by organized teams and shit, maybe to double up and siege a tower with two voidlings at a time (at least one will make it to the tower)...but otherwise, it probably wont see the light of day...Or at least, its passive wont.

I also assumed it would ignore creeps and creeps would ignore it while it travelled to its ultimatum...Needless to say, that was false. Maybe if it was rushed/gotten early game when towers are a necessity to take out (they hurt early-mid game) I could see some sieging going on but...?

I put this in balance cause I'm thinking it needs a buff or some sort if the only way to utilize it is to have at least 2+ people get it to siege a tower from the jungle...or early game when it'll probably be sold later in need of something like a Thornmail or whatever. Unless someone can tell me how I'm using it wrong, I'd see it as UP or UP in soloQ. It has potential though.