I had a couple of these guns, in both .45-70 and .30-06. Sorry, but the barrel adjusment feature absolutely does work, within the limits of its design. The small adjusting wheel, when turned according to directions, definitely moves the POI of the two barrels closer together or further apart on the horizontal plane. If the barrels shoot to different vertical points, that can also be changed by inserting shims between the end of the barrel and the collar that joins the two barrels together. The gun is easily scoped using one-piece air rifle scope mounts, available in various heights and very inexpensive. The open sights work well, but are ugly as sin. It's also easy to install a rear peer sight from XS sights...the one that is designed for the Ruger dovetails fits perfectly, and is especially appropriate on the .45-70 gun. Getting the barrels to group together takes some time and effort, but it can be done. Overall accuracy is very good for a double gun...one of mine would produce composite groups (2 shots from each barrel, 4 shots total) of less than two inches at 50 yards.
They aren't high-grade guns by any means, but they give you the double-rifle experience for about one tenth the price of just about any other available alternative. In fact, one of the ones I had was equipped with really beautiful wood...the others, not so much. If you want a rifle to take out of the box, sight in and use for long-range hunting the next day...forget it. Double rifles simply don't provide that. If you are willing to play with loads, barrel adjustments, sights, etc. then these guns can be a lot of fun and a great value. I will almost certainly pick up another .45-70 when the chance arises.