If my memory is correct, this was the first Costco built in the Valley and it remains the standard by which all others should be judged.
In addition to the regular Costco merchandise, this store seems to get the best selection of special deals and traveling shows of any store in the Valley.
Plus, like many Costcos they have a gas station selling cheap gas and this store even has one of the best drive-through carwashes that I have found in the Valley.
Plus, its in North Scottsdale so tax rates are lower and there is no food tax like in Phoenix... and not only might you see celebrities or professional athletes while shopping, you can likely even get numerous references for plastic surgeons if that's on your list as well :-)
Enjoy!