| whenever i get that late in a game to make ultralisks, it's usually better to make a defiler for the gas cost or even guardians. a lot more positive uses (spells/attack range for guards) than a meat-shield.
i hardly ever see anyone use ultralisks, but not to say that they are not a definite plus for any ground force.
the main difficulty most zerg players find is balancing the gas costs of high-end zerg units once that hive is made. ultralisks are 200 gas (plus the almost mandatory upgrade in order for ultras to have any longetivity of 200 gas for speed), guards upgrade cost 100 gas (and you'll probably be making more than one in order for air-ground power to be effective not to mention upgrading spire into greater spire costing another 150? gas and the 100 gas cost of making the muta), defilers cost 150 gas along with 200 gas for plague and another 100 for consume, gas to make hydralisks and on top of all that gas to upgrade your units (like attack/defense and adrenal glands for lings)
so ultralisks get relegated to the last in the list of making zerg high-end units cuz there are just other units that are better once that hive is formed.
yeah....
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