Been using a red dot on the shotgun for many years. I mainly want it for slugs at distance, much more accurate than a bead. A lot of times I will not even turn my red dot on, just use the fiber optic bead. For flyers you have to be careful and not "aim" at the clay but instead use the red dot as a bead, if that makes sense. Aiming will usually result in aiming directly at the clay.
But with a little practice you can shoot fliers just as well as using the bead.