It was the original heavy duty, 4 channel controller for Serato DJ, this was back in 2011. Since then, many other controllers have come and gone. Some better, some no where near as good.
Now, Numark have re-vamped the original beast and made it better in a few ways.
The Numark NS6ii has the same 4ch stand alone mixer as before as well as touch strips and heavy duty build. The inputs also allow for Serato DVS control with the optional plugin.
Performance pads: Each deck has 8 LED, RGB backlit MPC style performance pads now standard on most controllers.
Jog wheels with built in display : Lifted right out of the wheels from the Mixtrack Platinum, the NS6ii has some very tasty looking jog wheels with a 2inch display in each showing track status, pitch and BPM. (Unfortunately not track title or artwork)
Dual USB interface : This was something only the bigger boys had, but now you can DJ back to back with 2 computers hooked up at the same time.
Check out this video:
Priced at approx £679 and includes FULL Serato DJ software.
Pre Order here: http://www.westenddj.co.uk/numark-ns6-ii-dj-controller