I've had it fielded against me a few times and suffice to say that if it gets past the blast weaponry and my punisher cannon fire, then I'm in trouble. Clumped nobs are a danger to you if your opponent ever fields barrage weapons thanks to the sniper effect of those rounds, wyverns being a particularly fiendish foe in this regard. On the other hand, if you see a covered approach to a vulnerable pack of vehicles then this speaks for itself. Remember to keep the warboss buried for as long as you are advancing, you really don't want him killed by lasguns on the advance or the charge!