They liked this one (well, the gravy anyway)
I have 2 sixteen year old cats, one of whom had renal failure. Bought these and vet said specialist renal diet might help turn his kidneys around. Both cats seemed to enjoy these sachets, although the mostly ate the sauce and left the chunks behind!
Can't comment on efficacy for renal support, as Kaspar died from kidney failure within a few weeks of my purchase, but my experience with other Royal Canin Veterinary products (Urinary Diet and Gastrointestinal Diet) has been very good.