I'd be a touch worried about chariots if they charged (and lets face it, chariots are faster) due to the impact hits mauling a whole bunch of skinks. You would almost need to destroy the chariot in one go to stop it winning, of course depending on how well it rolls those impact hits. The others, the unit should be able to handle ok, or at least worry.
Never forget that the krox causes fear. You will hardly ever outnumber something, but it means your unit is immune to fear, and if something (like the mentioned chariot) wants to charge you, it must pass a fear check. Also if you charge something, they need a fear check. This is important because out on the flanks, they will get no leadership boost from the general and flankers often have average to poor leadership.