It appears that you can get some good discounts but my goodness and you have to work for it!
Review by confirmed purchaser
It's not too hard to sign up for initially, but if you accept their introductory offer, you cannot then ask them to transfer the funds generated to your bank account. You have to order another shopping card in order to access your funds. This card and then only be used in a limited number of shops. So, all in all, I would not recommend top cash back unless you have a lots of time on your hands to try and save a few pounds. It's just too hard to access the funds generated, and this is not made perfectly clear at the start.No doubt it is in the small print, but who ever reads all the small print!Personally my wallet is already far too overfilled with discount cards etc and I was not happy at having to have yet another card.