When many (most?) folks who are used to shooting with irons first try an optic, they have real trouble finding the dot. They are accustomed to sighting right down the top of the slide, where the sights are.
With this optic, I think that the same approach would work, and it would be very fast to pick up the dot.
I suspect that this unit would be most at home on a carry pistol. It is small, low and compact.