I've never used a place like this to wash my car but I was borrowing a vehicle from a friend who lives nearby and I decided to meet them there as they wanted me to have a clean vehicle.
Overall I was actually impressed as they just do a basic wash on the exterior and then you pull your vehicle into one of the stalls to use the vacuum towels and everything else to detail and clean your car.
They have a time limit they would like for you to use but if anything you just need to honor it and be respectful to the other around you. If you spend 30-45 mins because u want to wax your car then your abusing the system. It took us longer as we were pulling Cheerios & other junk from van as if zombies attacked and we living in the vehicle for a month.
I would definitely consider using this place as one of the options for a vehicle I have when the cooler months approach as it's easier to stand outside to clean the vehicle vs the hot summer temps.
Vacuums are pretty strong and pulled up dirt and the dry towels made available in the stalls helped to get everything looking crisp and cleans. I do like that they have compressed air as one of my biggest peeves is when water comes out of the side mirrors onto the car when u drive away.