I have a ReefBreeders fixture so yes it comes with all the fancy features.
As a benefit, I would say its easier to acclimate corals to the light by changing the intensity. On a daily basis I have it set to ramp up and down like the sun with the maximum intensity is only on for about 4 hours.
I would give it a 5/10, because you don't need it to ramp up and down all the time, its just something cool and convenient..being able to dim it is all you need, definitely important.