We acquired some Camping Cheques from another Eriba owner who couldn't use them. I was very unsure about them but we just presented them at reception. One Cheque equalled one nights pitch, just had to fill in your name and address, there was a space for some sort of membership number but no-one asked for it. We found the sites online, funnily enough all 3 that we used were also ACSI sites. As we had bought the Cheques secondhand, so to speak, we got 7 nights for just over £6 a night, bargain. There don't seem to be as many sites, certainly not in Switzerland, but they were all ok. The scheme seems to work very well, if I was offered the Cheques again or got them with a ferry offer, which seems to happen, I wouldn't hesitate.