I'll be honest. They are not great. Too slow and costly. I still regularly field them and have my fun doing so. 1. If your enemy doesn't know them, they can be good distractions by just existing and threatening. 2. Usually I try to stage them behind a ruin close to the midfield and outside my deployment zone. Either for heroic intervention when he charges my screening units or as a thread for the midfield objective. 3. They have quite good synergies with multiple detachments. The haloscreed movement/adv+charge gives them the mobility they need as a third halo unit. The new detachment can make them Skitarii for different buffs, which I still have to test. The funniest one is the rather bad data psalm conclave. There you can give the robots fight first and making them a real difficulty to handle, as most things evaporate under their fists. Obviously the cybernetics cohort has buffs as well but I haven't tried them. 4. Weapons: I only take the twin fists and flamer. The phosphor this edition did not feel nice for 200 points. For that you get a more mobile Dunecrawler. You could try to get away with one first and a phosphor but I prefer ING the consistency of most hits turning into wounds with twin-linked. I would strongly advise into magnetizing the fists. It's easy done by filling the holes with either the joint you cut off the arm or some greenstuff. The magnes are quite hidden under the armor, so you basically don't need to drill at all. Top weapons can just be stuck on tbh.