science diet is like a very expensive version of IAMs or purina. im in canada and its sold in alot of vets office next to the medi-cal. i have done alot of research on foods and now feed my cats and dog orijen and love it. its pretty much the next best thing to raw food. they will eat it over temptations treats anyday. One of my cats had allergies to alot of foods and was overweight, but this food is so biologically correct that its cleared up all of her exsema and shes back to a really good weight without me having to regulate how much which cat eats. they're furs been alot softer and oddly enough my allergies (yes im allergic to cats) have calmed down alot too. its quite reasonable aswell... about $18 canadian for a 2.5kg bag!