I received a 1969 combo gun from a relative who was considering destroying it -- it was rusted shut and the stock was pretty beat up, although the barrel and bluing looked good. I accepted it as a project gun, and was able to strip it down, clean it up, reassemble and it looks shootable. Then I refinished the stock, and determined that I could not use the sights with my old eyes... so I found this article, and since I happened to have an "SeeAll" sight, I got to work. Here is where I am...
Next step - off to the range to sight it in!
4/4/17: update -- sighted it in at 50 yards, groups within 3 inches.
Well I like it so far... here are the features I like: passive device - no batteries, easy to use with both eyes open, easy to sight in. I wanted to be able to use the shotgun by pointing, so I needed a sight that I could use but not distract for a swinging shot. It had to accurate enough for accuracy with the 22 barrel within 50 yards too. I think you could use a red-dot sight on the mounts I used as well, which would work well for the 22, but not as much for moving shotgun targets. A low power scope would also suffer for shotgun use. So for me, using the gun as a "walk about gun" during squirrel and for rabbits, or pests at any season, with this sight works. But each to his own... if I could see them, I would have settled for the existing iron sights.