Late commer on the train, I see you already have your answer here lol. But just to add, yes get the RODI. I'd never run a reef without one. With all the money we have invested in live stock in our tanks, and all the years we try getting them just where we want them it's way to much responsibility to have someone els in control of the most important thing in my tank, the water. Not to mention as already said its the when you need it.
It doesn't have to be complicated to install. With all the available units now a days. Myself I just collect 30g the day before I need it, mixup the salt for an hr and do the change. Sure a 30g barrel in my living room isn't pretty. But it's there after the wife house to work and packed away by the time she gets home. She's never knew at all .