I buy some Great Value products, after I read the reviews. Canned beans, shredded cheese, mixed nuts, tortilla chips, and frozen vegetables.
I buy a lot of produce (no brand names), some dairy/eggs (brand loyal there), and meat (Aldi). The best Swiss cheese slices I ever tasted were a store brand - either our local grocery store or GV. My favorite canned bean brand is Dakota (Aldi). I think the Aldi refrigerated pie crust is better and cheaper than Pillsbury. I really have to return to making my own, though.
My daughter says that GV TP is as good as Kirkland. I couldn't tell a difference when I used to visit her. I don't know if she bought a certain kind - or whether there are choices with the GV brand.