I would be using the 590A1 for defensive shooting practice and home defense. That being said, I am with zippy and keep a handgun ready for problems within the home and my shotgun for situations outside the home. While the three foot long boomstick certainly packs a punch, the eight inch long handgun allows me to open/close doors, control lights/dogs, and more importantly, get on the phone. I have an 870 now and I am getting tired of always switching barrels for different applications. With the 590A1 I will have a gun setup for defense and the 870 set up for skeet or field.
I was under the impression that the bead was the fastest sight system. The low profile three dot sights seemed to offer more precision than the bead but not as much the ghost ring. The ghost ring seemed to be the most precise sighting system. In these areas, everybody confirmed what I already thought. I will have to get back to a gun store and agonize over it some more. I like the 590 for its rock solid reputation and affordability, but I like the sight offerings on the Remingtons better. On the Tactical Express 870s, Remington equips them with Ashley low profile ghost ring sights and the more epensive Police models can come eqipped with Scattergun Technologies' ghost ring and wonderfully huge front bead. Hmmm. Thanks for all the responses guys.