I'm also considering doing the show with tickets from ticketnet.fr, but there are still some things unclear to me.
The website mentions that the tickets are only valid on monday, tuesday, friday and sunday. Furthermore it states that you have to make reservations at least 5 days beforehand. Are these reservations made by telephone or are they done through the online ordering process? As I'm visiting thursday to saturday I only have one option, and I would hate it if my tickets end up being unusable.