Firebox work on values that all establishments should adopt. A good range of products, competitive prices, speedy delivery, good packaging, a little pack of sweets with every order and impeccable Customer Service. If they were on the high street you could compare them to John Lewis!
Both Tesco and Quidco offer good customer service. However, Tesco should consider updating their website as the user experience and interface are somewhat out of date.
I had purchased sky through quidco in July and have yet to receive my cashback. However, Quidco had been brilliant, I cannot fault their custoemr service and they are genuinely fighting sky for my cashback.