Update: After waiting far too long, I took the plunge and used ControlCAL to calibrate my 111 to the D-Nice settings. For a lark, I tried using ISF-Auto with the D-Nice settings and the colour sensor on to see what was what. Results? In "Pure" mode, the colour sensor still gives the picture a yellow tint in my viewing environment. In "ISF-Auto", no yellow tint at all. I don't know if this is a calibration thing or if ISF-Auto simply doesn't use the colour sensor, but I sure like ISF-Auto more.
I should also note that other than that difference, I do not yet notice a huge difference between ISF-Day/Night/Auto and Pure modes. Perhaps in a totally dark viewing environment with some more chromatic source material it will be clearer.
Other note: The ISF calibrations were done per D-Nice's recommended settings. ISF-Auto was programmed exactly the same as ISF-Day, but with the Intelligent Mode set to 1 instead of 0.
Other other note: is it just me, or is there not much of a difference between ISF-Day and ISF-Night?