So, I'm currently building a Screed fleet with an ISD-II leading the charge. It's got an empty Ion Cannon upgrade slot - and the card Ion Cannon Batteries stands out as one I've never used before. My eye has always been drawn to the much more glamorous Overload Pulse, but the ICBs are cheaper by 3 points, and also have a cool ability.
Their critical effect is to allow me to choose one of my opponent's command tokens and discard it. If he doesn't have any tokens, then it does one extra point of damage to the shields on the defending hull zone.
Given that critical effects are resolved before normal damage is applied, this is a surprisingly useful feature - getting an extra damage out of a critical effect is nothing to be sniffed at, especially given that it will be immune to defense tokens.
Plus, being able to strip command tokens - especially in conjunction with, say, a Tractor Beam, could limit my opponent a great deal.
What are your thoughts on and experiences with the Ion Cannon Batteries? Are they worthy of filling that useful Ion Cannon slot?