We have eaten at CRT twice since getting our TIW card. Both times I booked online and paid full price ( I didn't want to loose the time slot). I called shortly after making my online booking and told them I had a TIW card and asked for my discount. They refund me the whole amount then rebook it with the discount. my conformation number changes but both times I've done it I still got to keep my original time slot. They also ask to see the TIW card at the table as well!