I've been twice recently. The first time was reasonable. Not great, not bad. However, the second time was awful. The brush on the hot foam brush is knackered and has seen better days, so shampooing the car feels sort of pointless. The gloss wax clumps up and then sticks on the car like tree sap. Ultimately, you take a car in that's a little bit dirty and when it finishes and dries, it's still dirty.
The vacuum is even worse. Don't even bother.