It's good to wear (if you stack it up and have over 2-300 minimum that is) -to prevent all sorts of Impairing effects such as: Paralysis, Faint, Confuse, Fear, Petrify and Candy. You can get lvl 70 earrings that offers a 60% to the Resistance stat, though it doesn't work exactly as %, seing as you still get struck by those immobilizing effects even if you have 120% and 200 resistance stats on top of it. It's well worth it if you really focus on only stacking up Resistance though, but if you just wear 1 item with it, it's pretty much a waste of 1 slot.
If you want to more frequently and successfully hit your target / s with impairing effects mentioned in my upper post, you would need to stack alot of Success Rate items. On the other hand, if you would like to more often block incoming debuff effects on you, it require you to stack the Resistance Stat.