I just bought the DDJ-RZ (and waiting for the RZ2 to come out in the next week hehe). The main reason I went with the RZ rather than the RZX was size. The RZX is HUGE, and really needs a flight case to protect the screens so the combination is around 30kg. If you're not using it for mobile use that might not matter, but for me it was a killer. Shame, as I loved the extra control features
Mike