On landing on a new world a dalek expeditionary force deploy six of these heavy armoured Daleks to establish a perimeter around the saucer. Their legged chassis make them immune to weapons designed to cripple the normal dalek travel machines by interfering with their gravitic propulsion systems.
Great design and a suitable Achilles Heel plot device (which all great villains/monsters need) might be being tricked into shooting their own legs - or possibly having a critical blind spot beneath them?
Awesome Don't see too many variants to the dalek chassis (not counting slight upgrades over the years)... only seen a heavy combat version in a 7th Doctor episode and the Dalek Emperor. This one is very cool as well. Out of curiosity... conjecture or canon?