I've never heard of it.

Looking at the ingredients though, I don't think I'd feed it.
Salmon, Ground Rice, Corn Gluten Meal, Ground Barley, Ground Wheat, Salmon Meal, Corn Oil (preserved with mixed-tocopherols - a source of Vitamin E), Dried Beet Pulp, Canola Oil, Dicalcium Phosphate, Natural Flavor, Ground Corn, Potassium Chloride, Calcium Carbonate, Flax Seed, Choline Chloride, L-Lysine, Vitamin and Mineral Supplements: Zinc Sulfate, Ferrous Sulfate, Vitamin E Supplement, L-Ascorbyl-2-Polyphosphate (source of Ascorbic Acid), Copper Sulfate, Vitamin A Supplement, Manganese Sulfate, Niacin, D-Calcium, Pantothenate, Vitamin D3 Supplement, Riboflavin, Calcium Iodate, Pyridoxine, Hydrochloride, Thiamin Mononitrate, Folic Acid, Sodium Selenite, Biotin, Vitamin B12 Supplement
While Salmon is the first ingredient, the next 4 are either corn or grains. Corn actually shows up in there 3 times.
I'm also not sure on salmon being the only meat ingredient. I suppose it is for dogs with allergies?? But then why all the corn? I don't know. Maybe someone else will have better input.