Well, again, I'm not sure that the balance is perfect. But I arrived at the current balance through some testing, and in my tests this was what felt right so far. Basically, they won't freeze everything, but they'll freeze at least a third of the opposition at a time if you have them in equal numbers to the opposition -- and really, having 1/3 fewer ships shooting at your ships is an enormous advantage. This isn't like shield bearers or decoy drones (which take damage), or counter-shooters (which only block certain kinds of shots), or even force fields (which take damage and don't block all kinds of shots). Rather, these make the enemy ships affected completely useless during the interval in which they are frozen. It's a deceptively powerful ability, for that reason. Still might be on the weak side, I don't know, but that's not what my past testing had indicated so far. At the moment, I just need more data.