Received cashback below promoted rate, weren't interested in putting it right
I bought an LG OLED TV that was a competitive price, but made best with the promoted cashback rate on Quidco for TVs over £1500.
Cashback tracked at the standard rate and was paid on time, but not at the promoted rate. I raised a claim, but affiliate window and PRC Direct appear to have gone out of their way not to do anything to help Quidco.
Other than that, I'm happy with the TV, but would have got better service elsewhere for the same price. Delivery of the TV was pretty slow and the box was covered in thick dust. They also had to phone me up to take payment again, despite originally doing it online and getting a confirmation (I suspect it was to avoid some fees).
I generally try to support UK-based, smaller companies, but won't be using them again in future.