I've been feeding my indoor cats Science Diet Optimal Care dry cat food for years at my vets recommendation. I recently read an article on all the by products and fillers in Science Diet and was shocked especially given the price I pay for a bag. I was at PetSmart the other day, and they were having a sale on Blue Buffalo, so I picked up a bag and have been transitioning my cats over to it. They seem to really like it, and I thought it sounded like a great product, given that it advertises no by products or corn. However, I googled reviews and was horrified! It seems this brand has made a lot of pets sick and I am thinking I should just revert back to Science Diet. Has anyone out there had a bad experience with Blue Buffalo dry food? Any thoughts on what I should do?