Costco is good and well worth it. You will get Kirkland brand items for cheaper than the named brand items. Kirkland brand is very high quality items usually. You can save money on gas as well. From shopping experience to quality of the products, I will recommend getting costco membership.

For a comparison sake, I bought some vegetables from costco and aldi and let it sit in my refrigerator. The one from costco lasted 2 weeks more than from Aldi. I love shopping at Costco, but use your own judgement.