Aux- I don't think there IS an advantage.
I violate one of the "set in stone" beliefs of most CPFers. A fixed focus light, often as not, is NOT in focus because of variances in bulbs, reflectors, etc. I would MUCH rather have a method to "fine tune" the focus with each light source, leave the damn thing there, and go about my business. End of problem.
I also LOVE having the ability to go to a flood mode, ringy or not, when I need it.
I wonder about the smooth reflector change; the finely textured reflectors of mine give a tight, and artifact free beam.