I live a lot closer to the Costco in Matthews, but been here a couple times (either for gas) or picking things up after an airport run. Great place to shop (be mindful of the bulk though) and the monthly coupon specials are nice as well.
My one gripe with this location is the setup they have at their gas pumps. Maybe this location was put in as an after-thought, but it's hard to navigate and make sure you are going the right way if you are looking for a pump lane. Luckily it hasn't been too crowded when I've gone for gas.... but the Matthews location has a nice queue area where the cars are out of the way of the main incoming traffic to the stores.