I signed in to Complete Savings buying a train ticket from Greater Anglia. Basically you pay £15 a month and you get back: £15 worth of a Monthly Bonus, which in my case is a voucher to be used solely in Greater Anglia and so far I used each month, plus 10% cashback from retailers (we use Dunelm, MADE.COM, Clinique, Fat Face, Joules, B&Q and eBay quite often. There are many more as well), even if you buy clearance or sale discounted products. With the discount we are getting average £35 cashback every month. Sometimes they take a little bit long to give the cash back, but no more than 3 weeks, and sometimes if a purchase was not registered automatically you need to send them a mail with the receipt. But it always works. For us, this saves us with no effort £35 per month (the train voucher pays for the £15 to be payed each month). If you are a bigger retailer consumer, you can get even much more than that as cashback. I don't know why so many negative reviews, as when you sign in, it clearly says that you will pay £15 each month from the second month or you can cancel suscription anytime for free. Surely people make negative reviews to get an extra benefit (I find that quite annoying)