My cat has IBD and his new vet (long story) who is treating him for it wanted to try him on Royal Canin Gastrointestinal. He gave me a sample. My cat loved it (or maybe it was that he got his teeth cleaned and could eat again), but within a little over a day, he started vomiting worse than...
I used to keep one it the bathtub of my guest bathroom, but my dad recently fixed the shower and for a while it seemed like a friend was going to move in (still don't know what's going on there), so I moved that one. Now there both in the utility area.