The Allen & Heath dLive C3500 is their mid-sized control surface for their flagship digital mixing platform that includes absolutely everything a live sound engineer could wish for.
This surface boasts 24 full-size faders, 6 assignable rotary knobs, customizable soft keys, and two 12″ touch screens. The onboard Harmony UI is incredibly intuitive with pinch, swipe, and drag controls that any smart-phone user can understand. The transparency and power that this control surface provides is second to none.