I have used camping car park without issue. Only if they are at a location I wish to use, Nantes for instance.
I have used the other company Aire Park, but only at St Pierre Quiberon. Their instruction board is purely in French. Pay at the barrier and you get a receipt, a ticket for your window and a paper with a QR code allowing you to enter and leave and re-enter at any time during your paid time. I did have issues getting out and the help button worked well but the staff only spoke French. My French was just about ok for explaining and they remotely opened the barrier. I could not connect on their ‘free wifi’.
They are the company who manufacture many of the Aire Services brand of service pillars, usually recognised as they are fashioned in stainless steel. They also make electronic barriers for entry and exit to car parks and caravan sites etc, so it was only natural that they jump on the camping car park band wagon.
The one in St Pierre Quiberon has doubled in price since they took over. It used to be quite busy but my last 2 visits we were nearly the only van. Their website and systems are poor compared to the camping car park set up.
Davy