I love my set up, its pretty damn portable (especially if you don’t have to bring your own mixer) and its far cheaper then a new s4. So that’s my 2 cents anyways.
Edit: forgot to mention you also get full control over all 4 decks and effects banks (and have more then enough controls for the sample decks when traktor 2 comes out) which is not something you get with the s4.
The argument used to be that the S4 came with smokin hot software, but that’s not so much the case now. I’ve played with a DDM400 just a little bit in stores and I will say that I feel like the S4 is a better build quality.
thanks for the feedback! ATM, i am playing only at friends partys and some lil gig, going from 40 to 200 peoples. So there is no mixer where i play, as i don’t play in clubs yet (i’m 16).