Seriously, the Polychoke is the best thing that ever happened to shotgunning. We are not in a beauty contest. We shoot for fun and to kill game.
My advice to everyone that has those contraptions called "screw-ins' is that they go to their nearest gundealer and order a Polychoke II. Listen to the dealer bitch about Polychokes but buy it anyway. He may have to order it. You can order it direct from Brownells, Cabela, or Polychoke. Tell them what kind of gun you have, what gauge, and await its arrival. Screw it in and don't listen to the BS from other shooters. You will have the most versatile gun you will ever need from super full to wide open cylinder with a twist of the wrist.
Toss those screw-ins into the nearest trash can and be happy. A little secret: During turkey season, I use an Undertaker choke as it has a rifle like pattern that even the Polychoke can't produce. Other than that, give me back my Poly II. It unscrews and screws back in quite easily to use a specialty choke. For most uses, you will never need anything but a Poly II. Best money I ever spent. They are rated for steel shot in the same choke configurations as the screw-ins, the more open settings. For slugs, use cylinder, for buckshot, do a litle patterning to get the best setting.
Had a bunch of jackleg, shade tree gunsmiths not tried to install these variable chokes on fixed choked barrels when they first became available, they would be more acceptable. If you have a fixed choke barrel, have Polychoke install it. It will be done right. For screw-in barrels, you can do it your self in less time than it takes to unwrap the package it came in.
Ain't nothing more wicked looking on a HD gun than a Poly. Makes these short barrels good for hunting and HD and they do make the HD look fierce. They look fine on my hunting guns, too.