I was just wondering how many of you feed your cats Purina Indoor Formula Cat Chow?

I heard from Shirley that corn based food is not good for cats. But I have been feeding them the indoor formula for over a year now up until a few months when I switched them to Hill's Hairball food and then I had to switch them to Hill's sensitive stomach and now they are back on the Indoor Formula.

Thanks for any suggestions,
Melissa