I just recently purchased the N4 as well. If you have any external gear (turntables or CD players) you may want the N4. I have quite an extensive older vinyl collection and the N4 lets me incorporate that into my sessions. Like Frosh mentioned, the N4 will give you 4 deck control in Traktor or VDJ. You may want to check out the Reloop Terminal Mix 4 as well. Supposed to be in the same price range as the N4 but offers more buttons. I added an LPD8 for cuepoint triggering.