Love it!
First had Hill's Prescription Diet Urinary Care C/D, but way too expensive and you pay extra for the brand rather than the quality of food. I switched to Royal Canin Urinary Care because I found it a bit cheaper, but then one of my cats started to vomit everyday and became so constipated that I had to rush him to the vet. It also negatively affected both of their stools (i.e., hard goat-like pellets instead of their normal stool). Switched to this finally 4 months ago and love it!