I could have seen it working if it gave you just a subtle idea of where your opponents can be, like a glare on one side of your screen just like when you're hit from a certain direction. But the ability to see enemies through the motherfucking walls might be gamebreaking if you're lacking a way to compensate it, and having to waste one of your two slots to do it means something is seriously wrong with the concept itself.
EDIT: Especially considering you need to be on fucking level 50 to do it. Which is absurd, immunity to such a strong ability should be available really early... it's the ability itself that should be limited to strongest players as it already is. I don't know, having played (and loved) the multiplayer beta, I find these two boosters to be extremely unbalanced the way they are presented.