Advantages by Avant Card

Has anybody used the Advantages by Avant Card newsletter? It has discount links ranging from 2% to 5% off. Some of the companies are well known such as Dunnes, Tesco, Currys and Samsung. There is normally a processing fee so for example the Currys Voucher for €250 costs €240 + €0.11. It states theres a 48 hour to 7 day delivery time which appears kinda long. I'm thinking of getting this but would like hear of other users experiences.