We have all our cats except the oldest on Wellness dry and tin. Our siamese is allergic to I suspect corn as she used to vomit up any cereal-heavy food we gave her.
The oldest one however, lives as an indoor/outdoor cat and the amount of things I have seen him eat is astounding. Our neighbour throws scraps out to the bird and so he routinely eats old expired mince, chicken, sausage and all the old bread that has been sitting over there exposed to the elements. He used to also get into their bird feeder and eat the seed out of it.
It's so aggravating as if you feed him any of the better brands of food he will not eat them and instead goes out and gorges himself on whatever he catches and the scraps. He was up in our neighbours' house the other day sniffing around for food. They are elderly and think food equals love and he has the 'I'm starving' routine down pat.
Everyone does really well on the Wellness however. Our cats had lost weight when we took them into the vets recently and their coats are so sleek and shiny with no dandruff or dryness. It is like crack for cats. I had a scoop of dry in my wardrobe from their breakfast and the Siamese was just sitting outside my wardrobe all day trying to figure out how to get in.
They all prefer drinking out of my fish tanks to drinking out of their bowls. Don't know if it's because the water is warm or has an earthier taste to it but one of our cats was very put out when I covered them all up so he couldn't get into them!