Who doesn't love Costco? I mean c'mon - free samples, excess amounts of everything you don't need and endless amounts of people watching. I have been a costco customer since the days of Price Club so I feel entitled to give an official review.
I utilize costco for several things that have become truly life changing - gas (cheapest in the city); lox; rotisserie chicken; alcohol; flowers; $4 chicken Cesar salads; luggage
But seriously, if you only use your costco membership for gas, then it's well worth it. It is usually $0.30 less than anywhere else in the city.
Or... just samples. It's enough to put a smile on your face :)