I have had good and bad luck with Sportsman’s Guide. At first I bought several items with no problem then had a series of defective items including some binoculars. They were inexpensive but had BaK4 prisms, so I thought they had to be OK. I ordered 6 various ones and I think 4 of them were defective.
The two which were not defective did indeed turn out to be decent. Not in the same class as Zeiss or Swarovski but completely usable.
I later ordered another brand and it was defective too. I finally just gave up on them.
I wonder if they’re selling mfgrs seconds or units that are refurbished after being returned under warranty and not telling the customers. Maybe they get a really good deal on them. That would explain the extremely high incidence of faulty stuff.