On the one hand, this store has great merchandise, better than a supermarket, in terms of quality of food and other items. It's very affordable for what you get and we go once a month.
On the other hand, customer service is lacking. Ask where something is and it's only a 50-50 chance you'll be helped. Once I brought my wife's membership card to shop for her as she was busy. I was told that they can't serve me, it's against the rules. Okay, but they were very rude and argumentative about it. Also, if you want to know why something is no longer sold there, there's a book to write in your question. However, you'll either get no answer or a useless one.
POSITIVE NOTE: Their eyeglass center is fantastic and I give that one 5 stars! Great glasses that are affordable and repairs are often free on short notice. We've used that service for many years. The rest of Costco could learn from their great customer service. Their tire service is also very helpful too.