I use a lightning field in my league list and it has proven to be incredibly fierce in many games. It really does come down to luck but after having multiple players get bent over by it, it has acquired a massive fear factor. I add to that power by throwing it into a 20 blob of warriors with an mss lord and nemesor. Unless it's early game, the blob is given counter-attack and is played aggressively. MSS and LF can be counter-productive at times but with smart placement, MSS usually hits a specialist to negate the conflict. The staff the cryptek comes with is just like any other weapon upgrade for them. It's "free" and situational. However I always welcome an extra four S5 shots coming out of the blob against infantry.