I have been a member of Costco for around 15 years. I am a regular shopper there because I get good quality for low prices. I love their bakery products. Whenever I have to buy a dessert for a group, I buy it at Costco. I have bought shirts (for gifts) and occasionally tops, skirts and weaters there. I can't try on clothes there, so my clothes purchase is very limited. They also sell candies, movie tickets, game tickets, etc. are reduced prices. I always buy a few movie tickets there and keep those in reserve, in case I want to go to a movie in the evening, which is rare. I have bought cameras there and often get my pictures downloaded on a CD there. I had considered buying a TV there, although I ended up buying it at Fry's. They have electronics (computers, etc.) but I usually buy those at Electronics stores, although I did buy a sound bar at Costco.
They have excellent food- frozen, canned, boxes of cereals, tea bags, plus sugar, rice, etc. I rarely buy it because I live alone and can't finish it quickly. I do buy cereal, tea bags, nuts, etc. there.
I almost always buy gas at Costco for the cost savings. It pays for my membership fee in one year, so all the other savings are extra.
The part I love about Costco are the free samples of food and drinks (water, softdrinks, juices, etc.).