I agree. Promotion is when they start to come through. Level III Cerebrus just rocks, he runs across the battlefield, kills the mage, then next move runs away or kills another. Level II and III Drone Riders can do practically the same thing to Light Range. Blossom Mage, as stated before, is always awesome regardless of rank. The only Training Ground and Merc troop I legitimately don't have a use for is the Banshee. I rarely, if ever, come across a situation where she's better then the Sorcereress, but then again, my Banshee is only level 1.