Pretty poor to be honest, even claims through Quidco compare don't get paid. Had one with a tool shop where I spent over £140 and they said I spent £6 !!!
When you make the purchase based on the cashback/deal and don't get the cashback, or you have to put in extra work and PROVE you've jumped through all the hoops, it's pretty disappointing.
Won't be bothering in future, not worth the hassle