I usually set the Future to either 0,1 or 2. I've always been leery of going too aggressive with it. Since I don't remember ever getting nicked with it, maybe I don't have it dialed aggressive enough. Every once in a while I try one of my newer 4 or 5 bladed razors and didn't realize how uncomfortable they were to shave with. The DE razors are, in general, much smoother.
Of all the razors I have, my RR 37 is my favorite. Thinking about getting rid of all my others. I've been considering the Ikon X3 for my next razor so my question is: Are you happy with it?