We haven't done any of their vacation packages, used their pharmacy or eyeglasses services, or anything else yet really, just bought groceries. So this review doesn't apply to those things obviously...
Do NOT come here if you're in a hurry, there is no point, you will be fighting the crowds for a while, and then waiting in check out lines for a while, so do not even try to get "in and out" of here.
We love Costco, and come here to buy about 1-2 months of meat at a time (there are only 2 of us) as well as bulk toiletries. We save about 500 dollars a year by buying these items here instead of regularly at the other grocery stores. So the membership fee is definitely worth it, easily. This is also a great place to come if you have a party coming up and need to buy a lot of silverware, plates, soda, beer, etc.
Great customer service most days, every once in a while you get a cashier who clearly hates their life, but most of the times everyone is very friendly.
The food at the "restaurant" inside Costco some people rave about. I personally don't get it...we've tried several things from here and have never really been impressed. It is all mediocre at best.