I've had a set of gauntlets with +46/+47 parry made, as far as it goes just eyeballing it seems like there's a slight increase in parry, but nothing to make your panties wet over. Haven't done any hard testing on it since, like was said, ARC/GLA/Mage are the go-to classes at the moment. MRD gets very little love but can be utilized in a off-tank role for 2nd Moogle phase, and can put out a pretty good amount of damage.