I used my NS6 last night because my DDJ-SX has to go in for repair (faceplate buckles).
I had forgotten how solid the Numark build quality was over the Pioneer. The Numark is a solid unit! No faceplate buckling and it is thicker metal. No plastic shit like the Pioneer.
I love my DDJ-SX and I pre ordered the DDJ-SX but the build quality simply is no match to the Numark build quality.