With the stock bead or FO, you can hit a dove doing 60 mph at 30 yards, sounds like a sighting system that is hard to beat. Using a bead, most modern shotguns can hit a piece of notebook paper at 50 yards using slugs.
I used ghost rings for about 2 years in tactical competition, slowed me way down, as soon as I went to a bead again, times got a lot faster. I have used a Tasco PDP4, 40 mm red dot, and it is fast, but not very durable if you like to use your equipment hard.