The button system is fine on an arranger where organ is only one of the many sounds being used...the same goes for sliders...the latter` are better, but both are still compromises.

On an instrument that is attempting to pass itself off solely as an organ, and more specifically, as a Hammond replica, leaving off real drawbars is unforgivable.

I think think the Hammond XK3c system is the better way to go if one can afford it...otherwise, the Nord is a reasonable compromise and is a far better sounding unit than Roland's VK or Korg's CX clonewheels in my opinion, especially if you want to use the on board rotary sim...the Nord's is by far the most realistic and only the Hammond is it's equal.

Using a MIDI drawbar unit might help, but only if it is of a type that can be conveniently placed and operate on both upper and lower manuals simultaneously.

Ian