It's a convenient place to pump some gas. I used to go to QT but ever since I discovered this Circle K honors the Fry's VIP card that saves 10 cents per gallon, I've been fueling up here.
Other than that I've been in the store to grab an energy drink on one occasion, so I can't comment on the courtesy clerks.
It's true QT's are cleaner, this station is a little on the dirty side.