that location, with the activate "roll a die : skull kills 4 genestealer, other result kills the marine" doesn't seem very blanced, or at least very interesting to me.
pure random, with 50% risk to have a casualty with no reward ? whatever the situation I'll always let my marine inactive (I mean giving support or shooting) rather then activate this thing. The marine will stay alive untill the stealers attack, and if he dies at this point, at least that's 1 dead buddy instead of 2 ( the one dying on the activate roll plus the one dying facing the stealers.
Did someone actually use that generatorium activation in a game (not for pure fun ) ?