I thought RC was better (but not best) quality than the store brands - it should be @ 3 x the price - I paid £4.99 a box on offer. It does have the added omega 3 & 6 and egg (I think) which are good for CRF kitties?
Kitekat: With Poultry - Meat and Animal Derivatives (including min. 4% Poultry), Cereals, Vegetable Protein Extracts, Minerals, Various Sugars. Which is not much different from Royal Canin pouches: meat and animal derivatives, fish and fish derivatives, cereals, vegetable protein extracts, derivatives of vegetable origin, minerals.
But if its Royal Canin renal - ingredients look a lot better admittedly: Chicken meat, chicken liver, pork liver, maize flour,
sunflower oil, powdered egg white, fish oil, pork meat, cellulose fibre,
minerals, etc