I haven't done any testing on it yet, but this ability has made RDM x5 more fun since level 39^^.
I was fighting Soldier Crawlers in {Crawler's Nest} last night in a 3RDM/PLD/THF/DRK PT. My INT is 58 total with {Pumpkin Pie} and +13 from items.
I was landing Water II consistently for 140-145 damage, and landing Stone II for 110-120.
With {Refresh} from another RDM, and occaisional double {Magic} {burst}s (that's two MB in a row from me in the same single SC), I made a pretty damn decent BLM with quite a few side abilities ^^.
For RDM's wondering why their nukes aren't quite up to "par," I'd suggest using /equip macros to switch in a +1 wand and any other +int gear right before you start nuking. It's helped me tons.