I always get frustrated by these not having any effect after deploying them.
Can you clarify on which conditions have to be met for them to have an effect (i.e. how many turns they have to survive, where they have to be to be able to fire (if that's the point), how far they have to travel on the combat map,... - I think you see my issue).
I think these definitely need clarification in their tooltips.
Also: Some in mission popup indicating that something has been damaged would be cool!
Finally: Assuming that I am not using them the wrong way, I think these are also in for a buff in terms of how many population they are able to kill off - given how hard it is to nurse them into having an effect at all (at least to me)...
The motivation for my gripe is mainly that these are (as I see it) the only way to potentially soften a planet up for ground invasion in terms of how much opposition the landing forces have to meet - which is a fairly essential strategy in my book that should not be that frustrating to pull off.
Mantised
here.