Major Drawback: The Machine can not be trusted

while many space marine chapters place great value on great machines of war such as Predators and land raiders, there are some chapters that scorn the reliance on the adepts of the Machine god or has simply been with out the aide of Tanks and Machines for so long they no longer utilize them. Predators, Land raiders, Vindicators and Whirlwinds all have a 0-1 limitation (this includes the Predator Variants and the Land Raider Variants).