I've tried NB before - their allergy formulas are probably one of the most readily available cat allergy formula options (with a variety of choices, too). I had one cat do fine on one of the allergy formulas awhile back. I do have one cat who ever time she eats NB becomes very very ill - she just cannot tolerate it at all.
Thanks for the reply. I edited my post before I thought anyone saw it. I posted a different one which I think might help me more. I'm not familiar with the whole wet food and grain free food thing, so maybe that would help me.