Yes, its a good thing and is very worth it for PvP. What it does is minimize the damage done on critical hits. So, when getting crit my D-fist, this could come in handy.
IGN: Apologize - Lvl 60 Sieg
Road - Lvl 45 Sieg
Faith - Lvl 51 Sieg
"We are what we repeatedly do; excellence, then, is not an act but a habit."