This with no def, on a pally with no other defensive equips and with current armored (x2 def): +30 def.
This with no def, on a pally with no other defensive equips and with potential future armored (x1.5 def): +15 def.
This with no def, on a warrior with T6 helm, no other defensive equips and with current armored (x2 def): +35 def.
This with no def, on a warrior with T6 helm, no other defensive equips and with potential future armored (x1.5 def): +17 def.
This with no def, on a knight with T6 shield, no other defensive equips and with current armored (x2 def): +52 def.
This with no def, on a knight with T6 shield, no other defensive equips and with potential future armored (x1.5 def): +21 def.
This with +10 def, on a pally with no other defensive equips and with current armored (x2 def): +50 def.
This with +10 def, on a pally with no other defensive equips and with potential future armored (x1.5 def): +30 def.
This with +10 def, on a warrior with T6 helm, no other defensive equips and with current armored (x2 def): +55 def.
This with +10 def, on a warrior with T6 helm, no other defensive equips and with potential future armored (x1.5 def): +32 def.
This with +10 def, on a knight with T6 shield, no other defensive equips and with current armored (x2 def): +72 def.
This with +10 def, on a knight with T6 shield, no other defensive equips and with potential future armored (x1.5 def): +41 def.
Also factor in the significant bonus of being able to avoid armor break, and this armor is stupidly overpowered with a def stat above 0 (and still uncomfortably good when providing 0 base def).