I have never been there, but share your curiousness. Alas, what little I learned about it shows it a rather "upscale" event with, for recreational aviators, an unusual amount of featherbrained beauties around, and an equally unusual number of Porsches, Ferraris and such in the parking lot.
The bi-annual event at Biscarrosse seems more aimed at the modal recreational pilot, regretfully it was cancelled in 2014.