The only good thing about the RS tower is getting the ribbons for your pokemon before you transfer them. I made sure all my ADV pokes had the lvl 100 ribbon.
Unfortunately, this came back to bite me in the ass. Since all my pokemon were lvl 100, I could not redo their EVs for D/P. Now i'm stuck with a 252atk/252spe ddmence and I really want to give it some HP, but can't. Just a warning.
Anyway, the RS tower is unbelievably easy compared to the ultragay DP tower. Just make sure you have a way to deal with lati@s and you're golden.