I will say I've had some.. limited success with Kroxigors in several instances. They're great for counter-charging infantry/cav that get into your lines (skinks retreating away say HI), or for holding down something equally as 'tough' as they are. Had a unit of 3 hold down a unit of 5 Blight Kings for a full 4 rounds of combat, swinging away at one another (while in a regenerating TQSH though). I've sent them character hunting with a skink priest with trappings before, and they were alright, since keyword shenanigans + rerolling saves. They managed to take down some weaker characters, but (again) they held druthu for 4 turns. Opponent was obstinate to kill them, but just couldn't.
The susceptibility to rend -1 hurts them a fair bit, and I would like them to either get a better save, or become immune to -1 rend. Otherwise, I find them a solid unit, and would get more... if it weren't for Finecast. The 3 I have are of the woogity variety.