My cats have been eating the new IAMS cat food for several weeks now. The cat food that we were given to try, and now have switched to and use regularly, is the IAMS Proactive Health Indoor Weight and Hairball Care. I must say, at first, the transition was a bit rough. My cats have had some issues in the past with coughing up some hairballs, it was no big deal. Immediately after starting this food, they were coughing them up all day long!!! It was really rather disgusting, but I was shocked to see that they had so much fur stuck in their bellies, and this food helped to relieve that. After about 10 days, there have been no more issues. No more nasty hairballs. I have decided to stick with this particular formula food because I believe that it controls the hairballs, and I like that the food is in very small pieces. My cats also LOVE to eat this food, so it must be flavorful! I would recommend this brand and formula cat food to all indoor cat owners.