I like the 12 +1 Skrox. I field them 7x2 (7 skinks in first rank + 5 in second +2 krox gap)
I run them on flanks of my blocks. So they can counter charge and give +3 to CR with charge + flank + 1 rank
They can also be a threat to chariots, light cavalry and other chaff. Even they can charge heavy cavalry that depends on charge bonus. (Not MC)
Also you can field two units like this to run aside a COR delivery bus. As they are fast enough to reach the same spots on the battlefield.
For nearly 700 points you can set a nice flank.
120 Skrox (12+1)
120 Skrox (12+1)
180 naked CoR (6)
270 Oldblood on CO
-Light armour;Crown of command; luck stone; Armour of destiny; Great Weapon.
Where crown of command is the masterpiece as your oldblood can charge alone out of the bus and hold an entire block on his own. While your CoR and Skinks keep moving through the flank and next turn flank & Rear charges the unit the Oldblood is engaged.
The oldblood would be counter charged, if enemy is able to kill you with the unit (KB), throw a challenge.