I belong to a feline diabetes forum and many of the people there are feeding this to their cats with rave reviews. There are distributors across the US and one in Canada, or you can mail order directly. He posts a nutritional analysis on his website, along with lots more info. Also it is recommended by Anne at www.catnutrition.org
I've never used it myself, because I make my own raw food, but I would definitely use this as an alternative in a pinch.