all depends on the weapon and armor. mine are 5 range and they die fairly easily at roughly 50% armor.
you might get 2 more round of crap damage as the other side will be shooting at you too.
obviously depends on how many sf and how many sf units too. is maybe 100-200 extra damage lots per unit per round?
that said, if it's a bunch of 6 range sf shooters against walls... will they come off the wall?