For quite some time I wondered how strong graphene is as armour.  Don’t get me wrong, I understand what graphenes is and would no doubt make excellent armour.  

It's just I want to know how good it would be and what design of armour is the best with this wonder material.

Would a spaced design work better or just having multiple stacks of graphene layered onto each other.  How is warfare affected when the armour has (temporally) out paced guns.  How can guns compete?

Let’s assume armour for a soil set in the field.  Not concealed and armoured jackets for now.