Costco Chandler has really been my primary store for years. Distance from my house to the Tempe location and this one is about the same but I keep coming here as it's "my home store".
Best part of coming is that it's on the way to work and the mornings are the best time grab some gas and beat the late afternoon rush. I have a Fry's Grocery card and collect points and despite getting the maximum discount, the prices don't seem to be as consistent to what I'm paying for Premium here a the pump.
Gas attendants are friendly and jump in to help when needed. If you have the Costco Membership and Credit Card as one it makes getting started at the pump a lot faster. If not, 2 cards are required, your membership card and then your debit card. Either way, you can get your friend to pay if they with your membership :-)
Multiple lanes with people who are and are not patient. The pumps have the extension chords attached so it will reach over or around the car depending on where your car's tank is located. It won't damage your car, but I get that people don't want to be bothered and have to be on a certain side. Especially if your not wanting to risk getting dirty by your car!
The only thing I'm not fan of is the entrance into the parking lot that merges with the exit from the gas station. With all the lanes exiting along with the incoming and outgoing parking lot traffic it can be chaotic and now that the apartment complex is partally completed, that entire exit area is just a hub for a fender bender. I think plans are in the works to fix, but doubt it so be careful!