To be quite honest I have never heard of them
BUT I've just googled for them and found that they have 4 campsites in France and 2 in Spain

their website

As they say You pays your money you takes your chance

Me I go low season (luckily no kids) and use Camping Cheques with my own caravan
we pay £98 each way for the tunnel crossing (car AND caravan) then £10.50 a night for the cheques which allow us to stay at well over 600 campsites all over Europe this year we've got 17 days to play with

Hi I know this is an old thread, but I too have just been looking at the prices offered by Europarcs and they are quite tempting. I cant remember seeing them as a company at any parks we have been to in recent years. So like Biddulphian I am very interested in anyones experience with this company
Kinds regards
Adrian