I like the feel of the sliders and knobs/pots as well or better than my MC6000 and K2

I've tried cheaper controllers and didn't like the feel of how everything worked together.

The differences will stand out most for those who use their S4 often with a lot of Traktor features: new flux mode, matching-color cue lights, brighter / more colorful lights, and a much more solid feel.[Update 12/13

All the knobs have a good smooth feel to them as you turn them and each has a center 'notch' so you can easily bring them back to center.