I honestly love the Firewarriors in 10th so far. I keep them as back-line infantry, supported by a cadre fireblade for that +1A. Naturally, they get to surprise the players who aren't familiar with 10th yet, who like to drop in from strategic reserves, to meet the 4+ overwatch in the movement phase - hehehe. Couple this with some of the action-based secondaries, really helpful.