I've purchased a $100 prepaid card here for 5 car washes of varying intensity. It's a better value than buying the washes one at a time. Expect to have someone come talk to you about the chips in your windshield. It annoys the heck out of me and I took a star off my review because of this. Just wash my car. Don't hard sell me on how my windshield is going to crack and need replacing because of a little mark in it right now.
The shop where you can sit and wait for your car to get finished is pretty well stocked with drinks and snacks. It's nicer than your standard gas station convenience store. But the prices are also higher than standard.
I keep coming back because of the prepaid car wash punch card that I have. The staff usually does a good job. They've forgotten to roll down my windows a couple of times to clean the edges where the window is usually tucked into the door frame. I notice this though because my dog likes to run his nose along the edge when the windows are a little open and his wet nose smudges are sometimes left over after the wash.