Eh. I had a costco membership for one year in order to get cheaper tires. I shopped there for food once. It's fine if you only eat shelf-stable heavily processed food. I prefer fresh produce. It really puts you in the mindset of high consumption. If I had four kids I would probably shop there more often, but since I don't I prefer the grocery co-op down the street that stocks produce from local farms and has bulk bins for almost everything so I can buy small quantities of really fresh food. I used to live in the north Texas food desert and I can imagine it would be a much more attractive retailer there because fresh, local food doesn't really exist in north Texas.
My main memory of Costco is seeing tons of products that were presented as bulk, but were actually regular. Like a bottle of 200 Tylenol (normal size that every small pharmacy carries) but at Costco it was in a quart-size bottle and each individual bottle was placed in a giant cardboard tray and shrink-wrapped to make it physically take up as much space as possible. And it was selling at an above-average price.
My main memory of Costco is seeing tons of products that were presented as bulk, but were actually regular. Like a bottle of 200 Tylenol (normal size that every small pharmacy carries) but at Costco it was in a quart-size bottle and each individual bottle was placed in a giant cardboard tray and shrink-wrapped to make it physically take up as much space as possible. And it was selling at an above-average price.