I come to this Costco about once a week, it depends on what I need.
The one thing about Costco I hate is that I come in with a list, and end up spending double the amount I originally intended. I also think that compared to Sam's Club, their selection isn't that good. However, I prefer Costco for their produce and meat, and their roasted chickens are the most flavorful in town.
You also can't beat the $1.50 hot dog combo. And unlike Washington (including the Issaquah flagship store where I used to shop), they actually use real kosher hot dogs, yay. They added a new item to the snack bar, some carne asada bake which is very large, and decent, only because of the low price. If it were served to me in a restaurant I would have ripped it apart because the flavor of the meat is not wonderful.