Reply to S4 and X1

I know...you saw the name of the thread and thought that some dumb*** is trying to figure out if X1 is working with S4. You are absolutely...WRONG
I am planning on picking up S4 in couple of days (finally made my mind over Mixtrack+NI DJ2+X1 ) and was wondering if I should get X1 as well at the same time? Is it useful? Or should I wait?

Thank You

P.