I do my acclimation manually. I turn up or down the LED intensity and raise or lower the lights as needed, based on what I'm seeing the corals are doing.
If you use the programmed acclimation, then you just set the power intensity once and the program will reduce the intensity for you... however, how would you know what the final intensities should be??? You're going to end up turning it up or down regardless based on the feedback the corals give.
That is a good point. I was playing with the one unit I got so far to see how it all works. My plan was to set the final setting then turn on acclimation and tweak if needed.