I did subscribe to Costco about a year ago
I did want to purchase one particular item the quality of which i was sure at Costco then I gave it a try
I am satisfied with every single cent i paid as I have already saves way more not only on that specific item but on many others too (gas is a plus indeed)
I say try it and you'll be surprised!!
However, you need to be careful you never know how easily you end up paying hundreds of dollars beyond what you had planned to pay!!!