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I've been reading posts and threads on this questions, but have gotten no solid answer. I've read the new Tau codex for what seems like the up'teenth time, but I still cant find a damn good use for the Shield Drones. What exactly are they supposed to do?

They add additional wounds to Crisis or Broadside squads for minimal points costs. Since they now take the T and Sv of the unit they're attached to, adding them to a broadside squad means you're getting 2 additional T4 2+/4+ save for 20 points each, plus the cost of the controller.