The major problem when considering an over/under shotgun in relation to quality is how much quality is necessary. For trap, skeet, and sporting clay shooters who are regulars or worse, competitive shooters, none of the guns on the list will hold up. For a normal hunter most of them will hold up for the life of the hunter because they go through fewer shells in a year than a clay shooter goes through in a day.
The other problem that affects both side by sides and over/unders is that getting the barrels to shoot to a particular point of aim is difficult and expensive. That means that most of the guns on the list will not shoot where they should.
For those less experienced with shotguns, it is very common for clay shooters to either shoot single barrels like Remington 1100s or 870s, or Browning BT-99s when they have limited funds, or to spend considerably more money on their over/unders. I am not a competitive shooter but I regularly shoot against guys who have spent over $10K on their shotguns.
My go to trap gun is a Winchester 101 that I bought new in 1966. (It still works and has not been rebuilt.) When hunting birds in Illinois, I use a 1983 Remington 1100 Special Field in 20 gauge. In other states I have another Winchester 101 in 12 gauge with a 28" barrel that is also set up differently than a trap gun. (Trap guns need to shoot to a higher than hunting guns and normally have longer barrels as well.) My Winchesters were both built in Japan, but are now built in Belgium.
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