I always add stompas to the boyz mobz rather than take a stompa mob. Stompa mobz are just too vulnerable to suppression and being broken. And if they do get broken, that's probably it for them given you need a 5+ to rally. Stompas are great with boyz though as they give a massive boost to the mobz firepower.

Oh and yes, in both games I've played the stompa mob has been broken on turn one and then stayed out of the game. They'll not be alone again!

Would you suggest the 'all-gun' variety then as an upgrade to the boyz unit?

I find Stompas are really a vehicle to get Supa-stompas, I never take them on their own.

_________________
Fear is for the enemy, fear and bullets.
-James O'Barr, the Crow