It's OK. All of the Hills prescription foods are a little low in protein for my liking. Since it is a limited ingredient diet, however, it is missing a lot of the nasty fillers they use in their other formulas. Are you using the dry or canned?
If the pea & duck work for your kitty, I would do the Natural Balance version of it. No script, higher protein, no BHA in the dry food, better price...
I just got the dry to try for right now.
I plan on getting the wet later on.
My Sphynx get Natural Balance lamb and rice for wet food.
Oreo seems to like the d/d.
All the other cats were smelling the bag.